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CMOS Problem

Trish's Escape from Hardware Hell Help Board » Hardware » Motherboard / CPU Related » CMOS Problem « Previous Next »

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Harvinder Singh
Posted on Thursday, August 22, 2002 - 7:33 pm:   

I am facing a trouble with my Computer System.
My system suddenly one morning showed a messege as 'Keyboard is Locked On', I thought that may be somehow some BIOS settings may have changed. I shot the Jumper J7 of my motherboard to clear CMOS Settings. Thereafter my system shows the messege 'CMOS Checksome error - Defaults loaded' , 'Press F1 to continue, DEL to enter the setup' but my keyboard does not response to any key pressed.
My conclusions:
1. My Keyboard is OK as I checked it on many other systems.
2. When system starts up all the three lights on the keyboard blinks once, so the keyboard port is OK. I also checked the contact points of the port using a multimeter.
3. My CMOS battery is OK as I tested it with multimeter and it was showing 3.08 volts.
4. I left my system with no RAM,no HDD, no battery, and CMOS clear jumper shot for around three days so no chance of some virus.
I am not able to understand where the problem is. The configuration of my system is as follows.
Motherboard : SIS 620 chipset (Tomato)
Processor : Celeron 500
RAM : 128 MB
Sound Chip : ESS Solo 100
HDD : Samsung 20 GB
Please help me out if you can as I am in a great problem due to my system.
Hope for a quick response.
Harvinder Singh
Posted on Friday, August 23, 2002 - 9:55 am:   

CMOS checksum errors usually indicate a bad cmos battery, assuming that you checked the voltage of the battery with no load on it, You may want to recheck it while in the computer with the power off and unplugged (while the battery is doing it's job) you may find that it is actually well below your first voltage check....
Posted on Saturday, August 24, 2002 - 6:56 pm:   

You may have experienced a sticky key on the kybd., but simply trying it out released it. That's my guess. As for the CMOS error, that reflects a change as the kybd. was in error and when booted up showed that, The defaults came into play and all you need to do is return bios setting back and save them upon exit. It may even show another cmos error again as you just changed the bios settings so in effect that's true but the next reboot it will settle down and not repeat. You should replace the cmos battery, regardless as 3.1 or 3.3 is desired even if 3V is showing, the cost is very low so no further possible cmos error from a bad battery at fault.

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