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  Can a bad CMOS battery cause a computer to not boot up? 
 
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Tanner Blackwell Oct 27, 2004, 12:45pm EDT Reply - Quote - Report Abuse
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I am just thinking about things as to why my computer is not booting up all the time....sometimes it will, but then freezes, but most of the time it will just turn the fans on and not boot up..I have come down to the thought that it is either two bad RAM sticks, a bad CMOS battery (not sure about), or a bad power supply.....unfortunetly, I do not have anything at the moment to test the power supply or anything...so if someone could just give there opinion on this matter, then I would be very grateful :

Tanner


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Chris McNally Oct 27, 2004, 12:56pm EDT Reply - Quote - Report Abuse
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>> Re: Can a bad CMOS battery cause a computer to not boot up?
Flat CMOS battery shouldn't cause a problem booting, it just won't save your Bios settings when you switch it off. Psu sounds most likely, but get it running if you can and run memtest86 if you want to rule out memory as a problem

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Chris McNally

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E-mail: chris@hardwareanalysis.com
jmerc Oct 27, 2004, 01:57pm EDT Reply - Quote - Report Abuse
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Edited: Oct 27, 2004, 02:00pm EDT

 
>> Re: Can a bad CMOS battery cause a computer to not boot up?
The cmos batteries main function is to save the date and time.
But it should not interfere with the system bootup.

You may have a failing power supply, memory or processor. Anything is possible.

Give us some more history to work with such as system specs and when/how the problem began and maybe we can help you out.

Jay

Life is too short, make the best of it!
Tanner Blackwell Oct 27, 2004, 04:13pm EDT Reply - Quote - Report Abuse
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>> Re: Can a bad CMOS battery cause a computer to not boot up?
The problem started when I was playing a Diablo 2: LOD game, and then it just froze and the sound kept looping, and then I shut it down, and then it started freezing every once and a while after boot up. After a while, it just wouldn't start.
I thought that it was my processor, so I ended up replacing that, but then it still had the same problem...I found out that my power supply had leakage in it from one of the black circular resistors in the circuit board... so then I took my cousin's power supply, beacuse he wanted me to see why his computer wasn't starting either...his fans would come on, and then wouldn't boot up...I figured that the power supply didn't have efficient amps...I checked and it said 13A/ 8A.....I am running on..

A main 40 GB HDD, A backup 80 GB HDD, ati radeon 9550, AMD athlon XP 3000+ barton core
(2) 256 mb pc 2100... a CD-RW, DVD-ROM, Volcano thermaltake 9.0, and a 600W max power supply, and a creative soundblaster 16 sound card....plus my floppy drive...

Jim B..... Oct 27, 2004, 07:47pm EDT Reply - Quote - Report Abuse
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>> Re: Can a bad CMOS battery cause a computer to not boot up?
Hi

You did not mention your Motherboard Tanner.

Jim

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Tanner Blackwell Oct 28, 2004, 11:39am EDT Reply - Quote - Report Abuse
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>> Re: Can a bad CMOS battery cause a computer to not boot up?
Sorry, I forgot about the motherboard, but I have a soyo Dragon KT400 ultra (Platinum edition)

Supreet Virdi Oct 28, 2004, 11:59am EDT Reply - Quote - Report Abuse
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>> Re: Can a bad CMOS battery cause a computer to not boot up?
Hmmmm sounds to me a problem with ur memory.....try running memtest86 for atleast 2 hours (8 hours recommended) and see it it detects any errors...PSU could be faulty ....but first of all try memtest86


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jmerc Oct 28, 2004, 01:00pm EDT Reply - Quote - Report Abuse
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>> Re: Can a bad CMOS battery cause a computer to not boot up?
All of the above and maybe a bad driver installation. Have you updated any drivers lately?

If it worked well at some point, have you tried a system restore point prior to when it started happening?

Jay

Life is too short, make the best of it!
Jim B..... Oct 28, 2004, 01:09pm EDT Reply - Quote - Report Abuse
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Edited: Oct 28, 2004, 05:12pm EDT

 
>> Re: Can a bad CMOS battery cause a computer to not boot up?
One thing I would suggest doing, take the power cord out of the back of computer, press the catch on the plug and pull out the main power plug going to the board, place back in and make sure it is well down (seated correctly), if its near the edge of the board the power socket place something under the edge to support it when pressing the plug in, plastic or a small block of wood will do, if you can’t find anything cut a credit card up into small squares and place on top of each other till you fill the gap, this is only to stop the board from damage as they are fragile and could bend and touch the case, and with battery on board you never can say what may happen if it shorted out with case.

EDIT
Read your posts again found no mention of the OS if its XP then carry on its not what I was thinking the problem could have been.

Jim

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Tanner Blackwell Oct 29, 2004, 11:29am EDT Reply - Quote - Report Abuse
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>> Re: Can a bad CMOS battery cause a computer to not boot up?
Well, then yeah, I am running on windows XP pro,


Thanks anyways

Michael C Oct 29, 2004, 11:33am EDT Reply - Quote - Report Abuse
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>> Re: Can a bad CMOS battery cause a computer to not boot up?
sometimes my clock resets like 4-8 hours behind what it should be?

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Markie Mark Oct 29, 2004, 04:41pm EDT Reply - Quote - Report Abuse
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>> Re: Can a bad CMOS battery cause a computer to not boot up?
If your clock is behind, then it is your CMOS battery?

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Bob B Dec 10, 2004, 07:54am EST Reply - Quote - Report Abuse
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>> Re: Can a bad CMOS battery cause a computer to not boot up?
get another battery Jeff?

Darren Forster Aug 15, 2011, 05:37am EDT Reply - Quote - Report Abuse
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>> Re: Can a bad CMOS battery cause a computer to not boot up?
Just reading this forum and I had such a surprise over the weekend with this one so thought I'd share it with everyone.

At the weekend I went camping and took my laptop with me, we use the laptop for a TV with a TV card when we go camping and thought that's what we'd do.

I was so shocked when I got to the site and realised the laptop just wouldn't switch on, all that I was getting was the DVD drive clicking, and the hard drive clicking and that was it.

Trying to think of anything it may been - I thought at first the hard drive had dislodged itself, or the DVD drive because early that day we'd been through an awful street in Liverpool full of potholes (it really was the worst street ever - nearly took the bottom out of my car on potholes can't believe the council would let a major route like this get so bad!).

Unfortunately when camping I had no screwdriver to check the hard drive or anything so left it till I got home.

When I got home I took the hard drive out, memory, DVD drive, Wi-Fi card and re-connected them all - nothing.

At this point I thought oh no has something seriously failed, then I thought a few days ago my laptop clock kept acting up, keeping the wrong time, and resetting to a few days beforehand.

I wondered whether it might just be the CMOS battery was flat - although I doubted it because when I've come across this in the past normally the computer just boots up and warns you that it's reset the CMOS to default settings.

Luckily I had a spare CR2032 battery in my spare car key so I changed it just to check, and guess what - the laptop worked and it came up with a warning that the CMOS had been reset.

That is so strange because I would never have thought that a dead CMOS battery could cause modern computers to stop working, as I've come across plenty of old computers from the past that work fine with a dead CMOS battery, mind you I have found that the BIOS in this Compaq laptop is a lot more stranger than a standard PC BIOS because even removing things like hard drives, and DVD drives in a laptop can force it to just not boot at all with no error messages, not really very helpful when your trying to diagnose a fault!

Paul Bateman Jun 06, 2012, 06:25am EDT Reply - Quote - Report Abuse
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>> Re: Can a bad CMOS battery cause a computer to not boot up?
A bios battery can definately stop a computer from booting. I fix computers as a hobby and I have had at least 8 machines in the past 5 years that have been completely dead. Of the 8, half were found to be caused by the battery having gone short circuit, which permenantly holds the CMOS in the reset state. The other half were due to the battery terminal voltage droping to a level that causes momentary loss of cmos data, sufficient to require a manual cmos reset to default settings.

Steven Rampmeyer Jun 08, 2012, 10:47am EDT Reply - Quote - Report Abuse
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>> Re: Can a bad CMOS battery cause a computer to not boot up?
If the battery goes bad it would not cause the computer to freeze. What will happen is that everytime you unplug or the computer looses power, you will get a screen at startup saying CMOS checksum error and asking you "Press F1 to continue, DEL to enter setup", at wich time you will have to enter setup and reset the time and boot order (if not set to default).

Steven Rampmeyer Jun 08, 2012, 10:54am EDT Reply - Quote - Report Abuse
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>> Re: Can a bad CMOS battery cause a computer to not boot up?
In addition to my previous post, the problem you are describing is usually the result of a device failing. It could be the memmory however I would unplug EVERYTHING except the keyboard, mouse and monitor and if the computer has PS/2 inputs for the mouse and keyboard use them if you can instead of USB devices, (it could be usb driver). Then I would remove one stick of memory at a time and try it in each slot by itself, if it still locks up it is probably your hard drive.


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