No Power

  • Thread starter Thread starter ColTom2
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ColTom2

Hi:

I have a Toshiba computer that when I press the On/Off power button nothing comes on. I figure it's either got to be the On/Off switch or the Power Supply.

Is there any simple procedure that I can check to see which it might be with an Ohm/Voltmeter or other means of checking? The switch appears to be working by the sound of it clicking. but I am not at all sure it is working.

Again if anyone cam tell me how to check both I would be most appreciative.
 
ColTom2 said:
* Hi: *
* *
* I have a Toshiba computer that when I press the On/Off power button
nothing comes on. I figure it's either got to be the On/Off switch or
the Power Supply. *
* *
* Is there any simple procedure that I can check to see which it might
be with an Ohm/Voltmeter or other means of checking? The switch appears
to be working by the sound of it clicking. but I am not at all sure it
is working. *
* *
* Again if anyone cam tell me how to check both I would be most
appreciative. *
Click to expand...

Notebook or Desktop? If the computer is a desktop is it AT (power switch
leads run to power supply) or ATX (front panel power switch leads go to
motherboard AND power supply on the back has its own rocker switch)? If
it's a notebook does it rectify the AC to DC inside the notebook or in
an external power supply?
 
In ColTom2 had this to say:

My reply is at the bottom of your sent message:
Hi:

I have a Toshiba computer that when I press the On/Off power button
nothing comes on. I figure it's either got to be the On/Off switch or
the Power Supply.

Is there any simple procedure that I can check to see which it
might be with an Ohm/Voltmeter or other means of checking? The switch
appears to be working by the sound of it clicking. but I am not at
all sure it is working.

Again if anyone cam tell me how to check both I would be most
appreciative.
Click to expand...

This is just a stab in the dark really but... Control Panel > Power Options
(classic view if needed) > second tab over unless Toshiba's mucked about
with it. Is the settings set to "Do Nothing" when the power button is
pressed?

--
Galen - MS MVP - Windows (Shell/User & IE)
http://dts-l.org/
http://kgiii.info/

"At present I am, as you know, fairly busy, but I propose to devote my
declining years to the composition of a textbook which shall focus the
whole art of detection into one volume." - Sherlock Holmes
 
Hi:

It's a desktop with ATX I suppose. because switch is in the front panel and runs along with other switch wires into a connector that connects into the mother board.

The only switch that I saw from the back was a selection between 115 and 220 volts applicable the power supply. It was red in color.

Hope this info helps.....
RobertVA said:
* Hi: *
* *
* I have a Toshiba computer that when I press the On/Off power button
nothing comes on. I figure it's either got to be the On/Off switch or
the Power Supply. *
* *
* Is there any simple procedure that I can check to see which it might
be with an Ohm/Voltmeter or other means of checking? The switch appears
to be working by the sound of it clicking. but I am not at all sure it
is working. *
* *
* Again if anyone cam tell me how to check both I would be most
appreciative. *
Click to expand...

Notebook or Desktop? If the computer is a desktop is it AT (power switch
leads run to power supply) or ATX (front panel power switch leads go to
motherboard AND power supply on the back has its own rocker switch)? If
it's a notebook does it rectify the AC to DC inside the notebook or in
an external power supply?
 
Hi:
If this is an oldie, (but goodie), I've salvaged a bunch of laptops
by changing the bios battery, which by where it's placed, was never
meant to be changed. Further reading your message, I'm assuming this
is a desktop. Pull all the plug-in cards you can and try it again. It
might even be a fuse on the power supply.
Take Care! Wear a ground strap, or be sure of no static.
Harry
 
Hi:

I have not pulled the power supply out yet, but would this power supply have a fuse or is one possibly located elsewhere?

Thanks for all your help....

Hi:
If this is an oldie, (but goodie), I've salvaged a bunch of laptops
by changing the bios battery, which by where it's placed, was never
meant to be changed. Further reading your message, I'm assuming this
is a desktop. Pull all the plug-in cards you can and try it again. It
might even be a fuse on the power supply.
Take Care! Wear a ground strap, or be sure of no static.
Harry
 
Hi:

I am also totally lost as to how you can check a power supply itself for failure. I know 110-120 Volts are going in, but what voltage is coming out of it that I could check with a meter or whatever?

Thanks
Hi:

I have not pulled the power supply out yet, but would this power supply have a fuse or is one possibly located elsewhere?

Thanks for all your help....

Hi:
If this is an oldie, (but goodie), I've salvaged a bunch of laptops
by changing the bios battery, which by where it's placed, was never
meant to be changed. Further reading your message, I'm assuming this
is a desktop. Pull all the plug-in cards you can and try it again. It
might even be a fuse on the power supply.
Take Care! Wear a ground strap, or be sure of no static.
Harry
 
In ColTom2 had this to say:

My reply is at the bottom of your sent message:
Hi:

I am also totally lost as to how you can check a power supply itself
for failure. I know 110-120 Volts are going in, but what voltage is
coming out of it that I could check with a meter or whatever?
Click to expand...

In my prior post I totally missed the "on" and read it as "up" (I dunno, old
age setting in early perhaps) but this is a question one can answer fairly
easily.

http://pctechbytesmedia.com/category/power-supply/

You can also see here:

What's a multimeter? How to use it to test your PSU rails? (howto):
http://www.devhardware.com/forums/p...a-multimeter-how-to-use-it-to-test-75111.html

I suppose I needn't warn you that you'll be playing with electricity and you
should, of course, exercise caution but what the heck? You're not playing
with that much, just don't do the testing while you're playing in the
bathtub or if you have a pacemaker or something.

--
Galen - MS MVP - Windows (Shell/User & IE)
http://dts-l.org/
http://kgiii.info/

"At present I am, as you know, fairly busy, but I propose to devote my
declining years to the composition of a textbook which shall focus the
whole art of detection into one volume." - Sherlock Holmes
 
Whatever you do, do NOT open the power supply case. Dangerous circuits are
lurking there just waiting to zap you - and it could be fatal.
 
ColTom2 said:
* Hi: *
* *
* I am also totally lost as to how you can check a power supply itself
for failure. I know 110-120 Volts are going in, but what voltage is
coming out of it that I could check with a meter or whatever? *
* *
* Thanks *

"ColTom2" <[email protected] <mailto:[email protected]>>
wrote in message * Hi: *
* *
* I have not pulled the power supply out yet, but would this power
supply have a fuse or is one possibly located elsewhere? *
* *
* Thanks for all your help.... *
* *

"HarryHydro" <[email protected]
Hi:
If this is an oldie, (but goodie), I've salvaged a bunch of
laptops
by changing the bios battery, which by where it's placed, was never
meant to be changed. Further reading your message, I'm assuming
this
is a desktop. Pull all the plug-in cards you can and try it
again. It
might even be a fuse on the power supply.
Take Care! Wear a ground strap, or be sure of no static.
Harry



power button nothing comes on. I figure it's either got to be
the On/Off switch or the Power Supply.
it might be with an Ohm/Voltmeter or other means of checking?
The switch appears to be working by the sound of it clicking.
but I am not at all sure it is working.
content="MSHTML 6.00.2900.2963" name=GENERATOR>
Click to expand...

PC Repair and Maintenance: In-depth Look at Power Supply
By Scott Mueller.

http://www.informit.com/articles/article.asp?p=31105&seqNum=12&rl=1

Note that 5 and 12 volt output is easily accessible on the drive power
cables.
 
http://www.compute-aid.com/atxspec.html
Am assuming you have an ATX compliant power supply.
--
Jonny

Hi:

I have a Toshiba computer that when I press the On/Off power button
nothing comes on. I figure it's either got to be the On/Off switch or the
Power Supply.

Is there any simple procedure that I can check to see which it might be
with an Ohm/Voltmeter or other means of checking? The switch appears to be
working by the sound of it clicking. but I am not at all sure it is working.

Again if anyone cam tell me how to check both I would be most
appreciative.
 
Hi:

I have a Toshiba computer that when I press the On/Off power button
nothing comes on. I figure it's either got to be the On/Off switch or the
Power Supply.

Is there any simple procedure that I can check to see which it might be
with an Ohm/Voltmeter or other means of checking? The switch appears to be
working by the sound of it clicking. but I am not at all sure it is working.

Again if anyone cam tell me how to check both I would be most
appreciative.

===============
If it's a desktop and there's no response at all, if no fans turn, it's
likely the power supply has failed. It happens. These are inexpensive and
easy to replace and there are no user-serviceable parts inside.

Even if there were a fuse to blow, you would not easily be able to repair
the cause of the blown fuse.

Most supplies won't start when disconnected from the motherboard, so you
can't really just yank them and test.

A new, good-quality and quiet power supply should cost you between cdn$40
and cdn$75. It's four screws and a few cables that have keyed connectors.
Take the current power supply to the store and get a new one of the same
type. Ask about quiet power supplies - these can make a very pleasant
difference.

Finally, there are safety issues you should not ignore. If the power
supply has failed, replace it and dispose safely of the damaged one.

HTH
-pk
 
Hi:

I have a Toshiba computer that when I press the On/Off power button =
nothing comes on. I figure it's either got to be the On/Off switch or =
the Power Supply.

Is there any simple procedure that I can check to see which it might =
be with an Ohm/Voltmeter or other means of checking? The switch appears =
to be working by the sound of it clicking. but I am not at all sure it =
is working.
Click to expand...


Checking to see if it is the switch is easy. Simply short the two
pins on the motherboard where the switch connects. The system should
power up when you do this.
 
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