switch

[bob]

I used to run my other motherboard without a case because it kept
itself in an ON state as long as I didn't boot down normally (I just
switched it on/off with the power supply).

However, I got a new motherboard, and it doesn't seem to keep itself in
an ON state if I switch off power suddenly. Is there an easy way I can
run this without a case so I don't have to keep starting it with a
screwdriver? I guess I'm wondering if I can buy the switch without the
case. Any ideas?

Thanks.

 

[Rod Speed]

(e-mail address removed) wrote

I used to run my other motherboard without a case because
it kept itself in an ON state as long as I didn't boot down
normally (I just switched it on/off with the power supply).

However, I got a new motherboard, and it doesn't seem
to keep itself in an ON state if I switch off power suddenly.

You should be able to configure it in the bios to start up when the power comes on.

Is there an easy way I can run this without a case
so I don't have to keep starting it with a screwdriver?

See above.

I guess I'm wondering if I can buy the switch without the case. Any ideas?

See above.

 

[Paul]

I used to run my other motherboard without a case because it kept
itself in an ON state as long as I didn't boot down normally (I just
switched it on/off with the power supply).

However, I got a new motherboard, and it doesn't seem to keep itself in
an ON state if I switch off power suddenly. Is there an easy way I can
run this without a case so I don't have to keep starting it with a
screwdriver? I guess I'm wondering if I can buy the switch without the
case. Any ideas?

Thanks.

To elaborate on Rod's answer:

BIOS option "Power Loss Restart". Options [Power OFF, Power ON, Last
State]

If you select [Power ON], then every time the power is restored to the
PC, the motherboard should switch on immediately as if the power button
on
the front of the case was pressed.

Paul

 

[UCLAN]

You should be able to configure it in the bios to start up when the
power comes on.

Or put a small cap across the pins that normally connect to the switch.

 

[Rod Speed]

Rod Speed wrote

Or put a small cap across the pins that normally connect to the switch.

You presumably mean a jumper.

That wont necessarily work, most systems will shut down if that switch is held in.

And you cant usually disable that behaviour in the bios either, since
its normally a last ditch way of shutting down when things have gone
completely pear shaped, just short of pulling the plug, literally.

 

[UCLAN]

You presumably mean a jumper.

That wont necessarily work, most systems will shut down if that
switch is held in.

No, I said and meant a cap. It acts as a short (because it's uncharged)
when the power comes on, but quickly charges and acts as an open.

Why did you presume I meant a jumper?

 

[Vic Smith]

I used to run my other motherboard without a case because it kept
itself in an ON state as long as I didn't boot down normally (I just
switched it on/off with the power supply).

However, I got a new motherboard, and it doesn't seem to keep itself in
an ON state if I switch off power suddenly. Is there an easy way I can
run this without a case so I don't have to keep starting it with a
screwdriver? I guess I'm wondering if I can buy the switch without the
case. Any ideas?

Thanks.

Here's one.
http://www.pccables.com/cables/03202.htm

Here's some info on ATX switching.
http://case-mods.linear1.org/case-mod-101-the-atx-power-switch-demystified/2/

Here's a method to jump the power connector so you don't need a
switch.
http://case-mods.linear1.org/case-mod-101-the-atx-power-switch-demystified/


I'm not recommending anything. I keep MB in a case with a switch
unless testing. When testing I use a switch, not a screwdriver.

--Vic

 

[CBFalconer]

I used to run my other motherboard without a case because it kept
itself in an ON state as long as I didn't boot down normally (I
just switched it on/off with the power supply).

However, I got a new motherboard, and it doesn't seem to keep
itself in an ON state if I switch off power suddenly. Is there
an easy way I can run this without a case so I don't have to
keep starting it with a screwdriver? I guess I'm wondering if
I can buy the switch without the case. Any ideas?

To elaborate on Rod's answer:

BIOS option "Power Loss Restart". Options [Power OFF, Power ON,
Last State]

If you select [Power ON], then every time the power is restored
to the PC, the motherboard should switch on immediately as if
the power button on the front of the case was pressed.

Nobody seems to have pointed out that just switching off the power
on a modern OS is very likely to foul the file system, and require
extensive file system testing at restart. Non-recoverable file
system damage is quite likely to occur.

--
Some informative links:
<<http://www.geocities.com/nnqweb/>
<http://www.catb.org/~esr/faqs/smart-questions.html>
<http://www.caliburn.nl/topposting.html>
<http://www.netmeister.org/news/learn2quote.html>
<http://cfaj.freeshell.org/google/>

 

[kony]

You presumably mean a jumper.

I've done it with a cap- and we even had a thread months or
longer ago where it was discussed but the person asking
tried it and couldn't get their board to work with the cap,
even using the same value I tried to test at the time
(granted my memory of it is a bit vague at this point, I
mean about that thread, and I couldn't actually SEE the OP
doing it so it's hard to say if it was done wrong).

So it definitely can work using a cap, but "might" not work
on all boards (unknown).

And you cant usually disable that behaviour in the bios either, since
its normally a last ditch way of shutting down when things have gone
completely pear shaped, just short of pulling the plug, literally.

Regardless of whether you consider it "last ditch" or not,
if it works properly as intended, it will do this fine per
the OP's needs.

 

[Rod Speed]

Rod Speed wrote

No, I said and meant a cap. It acts as a short (because it's uncharged) when the power comes on,
but quickly charges and acts as an open.

Makes a lot more sense to change the bios setting.

Why did you presume I meant a jumper?

Because using a cap is a bizarre approach.

 

[Rod Speed]

I've done it with a cap- and we even had a thread months or
longer ago where it was discussed but the person asking
tried it and couldn't get their board to work with the cap,
even using the same value I tried to test at the time
(granted my memory of it is a bit vague at this point, I
mean about that thread, and I couldn't actually SEE the OP
doing it so it's hard to say if it was done wrong).

So it definitely can work using a cap, but "might" not work
on all boards (unknown).




Regardless of whether you consider it "last ditch" or not,
if it works properly as intended, it will do this fine per
the OP's needs.

Not if a jumper is used.

And it makes a lot more sense to change the bios setting too.

 

[Sam Jones]

I used to run my other motherboard without a case because it kept
itself in an ON state as long as I didn't boot down normally (I
just switched it on/off with the power supply).

However, I got a new motherboard, and it doesn't seem to keep
itself in an ON state if I switch off power suddenly. Is there
an easy way I can run this without a case so I don't have to
keep starting it with a screwdriver? I guess I'm wondering if
I can buy the switch without the case. Any ideas?

To elaborate on Rod's answer:

BIOS option "Power Loss Restart". Options [Power OFF, Power ON,
Last State]

If you select [Power ON], then every time the power is restored
to the PC, the motherboard should switch on immediately as if
the power button on the front of the case was pressed.

Nobody seems to have pointed out that just switching off the
power on a modern OS is very likely to foul the file system,

Wrong, its usually fine as long as nothing is going on when that happens.

and require extensive file system testing at restart.

Hardly the end of civilisation as we know it.

Non-recoverable file system damage is quite likely to occur.

Wrong again, very unlikely indeed as long as the system
isnt doing anything writing wise when its turned off.

And that is all an entirely separate issue to what was being
discussed anyway, getting it back on again without a power
switch. Nothing to stop him shutting down normally if the bios
is configured to start the system when the power is applied.

 

[CBFalconer]

.... snip ...


Wrong, its usually fine as long as nothing is going on when
that happens.

The normal time to switch off is just after exiting something, when
the file system has just closed files and posted various
alterations (such as final writes, time of last access, etc.) all
of which is in the queue for the disk writing mechanism.

Not to mention power supply glitches while the heads are not yet
parked.

If usually (meaning sometimes) is good enough for you, I don't want
you near any of my systems.

--
Some informative links:
<<http://www.geocities.com/nnqweb/>
<http://www.catb.org/~esr/faqs/smart-questions.html>
<http://www.caliburn.nl/topposting.html>
<http://www.netmeister.org/news/learn2quote.html>
<http://cfaj.freeshell.org/google/>

 

[UCLAN]

Makes a lot more sense to change the bios setting.

Problem is that not all BIOS versions have that option.

Because using a cap is a bizarre approach.

Not if you know anything about capacitors. I've been using that
fix when necessary since the introduction of ATX (since power outages
caused a problem.) Not at all bizarre.

 

[Rod Speed]

Rod Speed wrote

Problem is that not all BIOS versions have that option.

Sure, but the vast bulk do.

And not all motherboards will start with a cap across those pins either.

Not if you know anything about capacitors.

Corse it is if it can be done in the bios.

I've been using that fix when necessary since the introduction of ATX (since power outages caused
a problem.) Not at all bizarre.

Corse it is if it can be done in the bios.

 

[Sam Jones]

The normal time to switch off is just after exiting something, when
the file system has just closed files and posted various
alterations (such as final writes, time of last access, etc.) all
of which is in the queue for the disk writing mechanism.

Nope, that is not the normal time at all if you are aware of the problem.

Not to mention power supply glitches while the heads are not yet parked.

Heads arent parked by the OS anymore.

If usually (meaning sometimes) is good enough for you, I don't want
you near any of my systems.

Usually means usually, and you and your systems are completely irrelevant.

AND there is nothing to stop the OP from shutting the system down
properly at the OS level and just using the power on to turn the system on.

 

[Dana]

Problem is that not all BIOS versions have that option.


Not if you know anything about capacitors. I've been using that
fix when necessary since the introduction of ATX (since power outages
caused a problem.) Not at all bizarre.

You are talking about two different types of caps. When you say cap, that is
a device constructed with two plates separated by air or some other
insulation that prevents DC from Flowing. So with this cap, you will not get
a momentary flow of DC.

Now a device called a SuperCap, has a dielectric that when first charged
will allow voltage flow for a very brief amount of time. These kind of Caps
are being used in electric car battery applications and some othe niche
areas.
Do a google on supercap and you will see some applcations it is used in.

 

[Rod Speed]

You are talking about two different types of caps.
Nope.

When you say cap, that is a device constructed with two plates
separated by air or some other insulation that prevents DC from
Flowing. So with this cap, you will not get a momentary flow of DC.

Yes you will with the bigger caps like an electro.

Now a device called a SuperCap, has a dielectric that when first
charged will allow voltage flow for a very brief amount of time.

Happens with all caps. The only difference is that the amount
of current that flows to charge the cap varys with its capacitance.

These kind of Caps are being used in electric car battery applications
Nope.

and some othe niche areas.

Yep, where small batterys were used to keep settings etc.

Do a google on supercap and you will see some applcations it is used in.

Dont need to, I know what they are.

 

[CBFalconer]

Rod Speed wrote:

.... snip about arranging for start-up on power on ...

Problem is that not all BIOS versions have that option.


Not if you know anything about capacitors. I've been using that
fix when necessary since the introduction of ATX (since power
outages caused a problem.) Not at all bizarre.

Please don't snip attributions for quoted material. The
attribution is the line that says "joe wrote:" at the start of the
article.

The major problem with the capacitor trick is that its functioning
is highly dependant on the rise time of the auxiliary (standby)
power line at power turn-on. Normally you will need to use an
electrolytic of suitable voltage rating, such as 7 volts. The only
reliable way to select the actual capacity is experimentally. If
the rise time is too long no size will work.

--
Some informative links:
<<http://www.geocities.com/nnqweb/>
<http://www.catb.org/~esr/faqs/smart-questions.html>
<http://www.caliburn.nl/topposting.html>
<http://www.netmeister.org/news/learn2quote.html>
<http://cfaj.freeshell.org/google/>

 

[CBFalconer]

Nope, that is not the normal time at all if you are aware of the problem.


Heads arent parked by the OS anymore.

They are normally homed to a suitable location when the drive is
inactive.

Usually means usually, and you and your systems are completely irrelevant.

AND there is nothing to stop the OP from shutting the system down
properly at the OS level and just using the power on to turn the system on.

That process is normal and entirely satisfactory. But the OP
indicated he wasn't doing so.

--
Some informative links:
<<http://www.geocities.com/nnqweb/>
<http://www.catb.org/~esr/faqs/smart-questions.html>
<http://www.caliburn.nl/topposting.html>
<http://www.netmeister.org/news/learn2quote.html>
<http://cfaj.freeshell.org/google/>