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How do I determine if my computer's CMOS is totally fried? Answered

Yesterday I got a call from my wife that she was bringing the computer back up (there had been a storm and she SAI(D she shut everything down normally and unplugged everything),  and she has this "message" that CMOS had failed and was loading default......press F1 to continue or F2 for set up.

Sadly, neither option actually works.  It  "sounds" like it is processing (looping?) but nothing happens.   Turning it off, waiting and back on again produces the same results and it doesn't get far enough into the boot process to access either the CD or the HD.

Give it to me straight....it's brain dead, right?

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canucksgirl
canucksgirl

Best Answer 8 years ago

It might not be... Go to this link, and then click on the CMOS Checksum Failed link (it will open a popup). It explains in detail what's happening and what you should do at this point.

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colorex
colorex

Answer 8 years ago

Check the voltage of the battery as well.

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colorex
colorex

8 years ago

I usually get that F1 F2 message when the CMOS has restored to defaults - in which case it's looking for an nonexistent diskette drive.

Try looking for a clr_cmos jumper on your mainboard. Should be 3 pins, with a jumper over two of them. Switch the position of the jumper, turn on the computer (it shouldn't do anything) turn it off, switch the jumper back, and see if the CMOS resets. You could alternatively remove the clock battery on the MB, it has the same effect.

Is the keyboard fully functional? Test it on another computer. If it's a USB keyboard, try a PS2 keyboard instead.

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Vyger
Vyger

8 years ago

From reading the threads I think you have hinted at what could be a large part of the problem. Get a new battery before you try and do anything else. At one time having a working battery was critical because the chips lost all the data if they lost power. Now they are flash memory, but the whole bios set up may still rely on some battery power for some things besides the clock. It could need the battery power to write changes to the flash memory. BIOS are very different from one to the other so this may not be a factor, you dpn't know. So start with a cheap 3 dollar battery because it could be the fix you need. If that doesn't work then move on to other things.

And by the way what I would next is start looking for a flash update from the motherboard maker.

And another possibility is a failing power supply. The voltage for the MB may be faulty.

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Goodhart
Goodhart

Answer 8 years ago

Thank you.