bios innaccesible.

  • Thread starter Thread starter timmo
  • Start date Start date
T

timmo

Hi,

I've recently booted up my PC and I get the following message at the POST:

CMOS checksum error-defaults loaded.
Warning!CPU has been changed.
Please re-enter CPU settings in the CMOS set up and rem to save before quit.

F1 to continue, del to enter setup.

I try del and f1 and get no response. I try to enter the bios before this
aswell and cannot get in.

Hope you can help.

many thanks.


Tim Vieweg.
 
| Hi,
|
| I've recently booted up my PC and I get the following message at the POST:
|
| CMOS checksum error-defaults loaded.
| Warning!CPU has been changed.
| Please re-enter CPU settings in the CMOS set up and rem to save before
quit.
|
| F1 to continue, del to enter setup.
|
| I try del and f1 and get no response. I try to enter the bios before this
| aswell and cannot get in.
|
| Hope you can help.
|
| many thanks.
|
|
| Tim Vieweg.
|
|
|

Hi Tim -

Do you have a USB keyboard connected to your system? If so, you probably
need to borrow a PS/2 keyboard to get into your BIOS. Read in your
motherboard manual, check on the manufacturer's website or call the
manufacturer and ask if there's an option in the BIOS to enable legacy USB
support; might be labeled such as "USB Keyboard Support via" with options
to select OS or BIOS - choose BIOS.

As to your problems with the checksum error: I would suspect that your
motherboard battery might be getting a little weak. Check the
aforementioned sources as to the location and type of the battery on your
motherboard and, if you have a voltimeter, check it: it probably should
meter about 3.3 volts when fresh. Anything lower than about 3.1 volts could
cause your computer to begin to have problems with retaining CMOS settings
and losing the system real time clock value. If you don't have a
voltimeter, you can usually have it checked at many electronics parts stores
(even Radio Shack or such store - I see you're in the UK and I'm not
familiar with your retail chains). There are occasions where your CMOS
settings might be lost without the battery being weak, but these are very
rare.

In any event, once back into your CMOS set-up menus, you'll have to reenter
everything. Again, you'll need the motherboard manual, etc., as a reference
in order to properly set these values. A good jumping off point would be
"Load Failsafe Defaults" if there is such an option.

Good luck.

Jef
 
"timmo" said in news:[email protected]:
Hi,

I've recently booted up my PC and I get the following message at the
POST:

CMOS checksum error-defaults loaded.
Warning!CPU has been changed.
Please re-enter CPU settings in the CMOS set up and rem to save
before quit.

F1 to continue, del to enter setup.

I try del and f1 and get no response. I try to enter the bios before
this aswell and cannot get in.

Hope you can help.

many thanks.


Tim Vieweg.
Click to expand...

The checksum error means the contents in the CMOS table that has a copy of
the BIOS is corrupted. You need to clear your CMOS by jumpering a 2-pin
header on the motherboard for about 10 seconds or by removing the CMOS
battery for a minute. You'll lose all custom setting and have to reenter
them in the BIOS.

Sounds like it is time to start looking for a replacement CMOS battery.

If you had just recently flashed the BIOS to update it, you must power cycle
the computer (power down and power up). Don't just hit the Reset button.
 
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