cmos battery question

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Zappa_0

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Jan 27, 2007
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if a cmos battery is dead or very low battery, can it cause problems of a pc not booting up properly as in no signal from monitor, no key board activity an not loading up? ive had this problem a few weeks ago but after taking everything out and plugging it into a different outlet it worked until power went out for around 12 hours today. power did come on for like 5 mins but went back out, pc was in the process of booting up when power went out again. also bear with me the laptop im on many keys wont work due to a curious cat and im using the on screen keyboard to type. thanks for any help you all can give!!!
 
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Zappa_0 said:
if a cmos battery is dead or very low battery, can it cause problems of a pc not booting up properly as in no signal from monitor, no key board activity an not loading up? ive had this problem a few weeks ago but after taking everything out and plugging it into a different outlet it worked until power went out for around 12 hours today. power did come on for like 5 mins but went back out, pc was in the process of booting up when power went out again. also bear with me the laptop im on many keys wont work due to a curious cat and im using the on screen keyboard to type. thanks for any help you all can give!!!
Hi Zappa
First Zap the cat.:D Ok It is possible that your cmos got messed up when the power went in the post sequence.You will need to clear your cmos Follow the instructions in you PC operating manual.
Good luck
Rex.
 
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Mar 16, 2002
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Zappa_0 said:
if a cmos battery is dead or very low battery, can it cause problems of a pc not booting up properly as in no signal from monitor, no key board activity an not loading up? ive had this problem a few weeks ago but after taking everything out and plugging it into a different outlet it worked until power went out for around 12 hours today. power did come on for like 5 mins but went back out, pc was in the process of booting up when power went out again. also bear with me the laptop im on many keys wont work due to a curious cat and im using the on screen keyboard to type. thanks for any help you all can give!!!
well most of the time a low battery just starts losing the time and maybe some settings, i dont know about it causing all the problems youre talking about
 

Zappa_0

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Joined
Jan 27, 2007
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ive had to reset time a fews time now. everything is getting power and it is acting like it is gonna boot up but nothing happens. ive got another pc doing the same thing too!

keys that are messed up: s d f g b 2 and tab ive got a new one ordered should be here soon.
 
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batteries are pretty cheap $5ish, i would replace them, they are watch batteries basically you can get them at a chain pharmacy, ie rite-aid, cvs, etc.
 

crjdriver

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Jan 2, 2001
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41,797
A bad cmos battery will not stop the system from post. It may return errors however you can pull the battery out of the board and it will still post [with errors]

To troubleshoot your problem, I would start by pulling power from ALL drives both hd and optical. Next remove any add-in cards like nic, sound, etc; leave just your video card installed. Now disconnect any usb device, any scanner, printer, card reader.

With just your keyboard and monitor connected, attempt to power up the system. If it does post you will get a display. Now reconnect devices one at a time and check for post. You will find the device that is stopping your bootup.

If it does not post like that, you will need to swap parts with known good ones; ie power supply, ram, motherboard, cpu.
 
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