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PostPosted: Mon Sep 30, 2013 11:21 am 
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Black Belt
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Joined: Tue Jun 12, 2007 10:47 am
Posts: 721
Location: Havana, Cuba
Hi friends, quite a long time out of the forums!!

yesterday a friend came to my house with his PC that wasn´t working from few days ago.

I turn on te computer and in the first run I got the message

CMOS checksum error
press f1 to enter setup
press f2 to load default.........

I entered in setup put the rigth date and time and then F10 and yes

after the reboot the pc enter windows normally but after a couple of minutes the PC restarted and i got the message:

BIOS ROM checksum error
Detecting floppy drive A media ...
INSERT SYSTEM DISK AND PRESS ENTER

I turned of the computer wait about ten minutes and then the PC starts fine again but after entering windows the pc resets and I got the same BIOS ROM checksum error again!

What can be the issue?
- CMOS battery?
- BIOS failing?
- Bad BIOS chip?
- Bad Caps?

or anything else.... Help me please

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PostPosted: Mon Sep 30, 2013 12:09 pm 
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Lead Mobo-fu Master
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Joined: Sun Dec 16, 2001 1:01 am
Posts: 14303
Location: Maine
you can refer to www.badcaps.net for more info on what to look for. bulging, leaking, domed caps.. Depending on make and model of PSU, that could probably use a look as well.

As far as the BIOS battery, if it's more then a couple years old it's a good idea to go ahead and replace it. If you have a multimeter, you could check the voltage, but I am not certain on what the zone is for what is good.

If the BIOS program was failing I would expect some other form of issue.. like a pixilated boot screen. Not to say that is not the problem, been doing more code stuff versus hardware. If the chip was failing I would expect, similar problems.

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PostPosted: Mon Sep 30, 2013 12:34 pm 
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Black Belt 2nd Degree
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Joined: Mon Aug 09, 2004 7:33 pm
Posts: 2743
Location: Milwaukee - Wisconsin
my money would be on battery.

-Roach

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PostPosted: Tue Oct 01, 2013 7:18 am 
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Mobo-fu Master
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Joined: Wed Nov 12, 2003 11:57 am
Posts: 20868
Location: 07438
Test the BIOS battery in circuit. First, remove the AC mains cord. Attempt a few starts to drain the PSU reserve. Then with a digital multimeter, the top of the cell is marked positive (+) and any bare chassis point or black lead terminal is negative (-). A good battery should show 3 volts. Any lower than 2.8 volts is critical and may cause BIOS settings to default.
That "checksum error" message covers up to 20 critical features.
The BIOS battery is only a redundant feature to retain BIOS settings in the CMOS memory when no power enters the PSU. Even if the PSU is not active, the +5 volt stand-by voltage powers the BIOS and USB circuits.
Depending on draw, the battery may last two years average.

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PostPosted: Tue Oct 01, 2013 12:16 pm 
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Black Belt
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Joined: Tue Jun 12, 2007 10:47 am
Posts: 721
Location: Havana, Cuba
well I tried last nigth a new battery (I had it in its package from a few months ago) and everything went the same, first boot the BIOS checksum error, insert the flpppy message

after that any time I turn the pc on It stucks on reading the Floppy disk drive and checking the DVD drive, but no video and no beeps at all.

Is it trying to start some automatic recovery??

I put the original CD on the DVD drive and nothing happens

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Things they would not teach me of in college"
-Wrapped Around Your Fingers-
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PostPosted: Tue Oct 01, 2013 10:57 pm 
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Mobo-fu Master
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Joined: Sun May 06, 2001 12:01 am
Posts: 37464
Location: Netherlands
Did you check the badcaps website?

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PostPosted: Wed Oct 02, 2013 7:15 am 
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Mobo-fu Master
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Joined: Wed Nov 12, 2003 11:57 am
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When you get that 'checksum' error message, go into the BIOS to check the date and time plus other settings. If the date and time wander off greatly, suspect a circuit fault that does not provide proper voltage to the BIOS circuit. Measure the +5 volt stand-by voltage at the main power socket.. the violet wire.. to ground. Should be right at +5 volts or maybe +5.3 volts max. A one-way diode from that feed powers the BIOS circuit. Another one-way diode from the battery is a backup. Gold contacts don't corrode or oxidize.. but almost every other metal will. Possible also there is a cold-solder connection that has now reared its menacing head, after many months or years of use. Any solder joint that appears "dull" at the surface can be suspect. But use heat sinks with any sensitive components, if attempting to touch-up any suspect solder joints!
But as evasive noted, inspect all large capacitors for bulging tops, excess leaning, or signs of leakage. The PSU also should be examined!

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