After updating bios cmos checksum bad
It appears that the computer is looking for a disc with the BIOS file on it. Since you lost the support CD which contains the original BIOS file, uownload the latest BIOS update from Asus (previously linked) burn it to CD or copy it to floppy if you have one.
Place the CD or insert the floppy before you power up the PC.
In a laptop, it could be sheathed in a holder of some type and be more expensive. Looking at the age of your machine pic above you might think is so old, is it worth repairing?
In your location the chip may be difficult to obtain.
ROM" whereas in the ASUS website and you download the BIOS file the extension in ". AMI" Read on section 2.1.4, Recovering the BIOS with Crash Free BIOS2. Burn both files (AMI and ROM and the AFUDOS program to CD and let Crash Free BIOS do its thing.
Recently I did a clean install of windows XP on my PC, everything goes smooth and no errors. Thanks & good luck Cmos equals continuous metal oxide semiconductor. I've been doing some reformat and clean install before and I never encounter this problem before its my 1st time to have this problem..
But after a day I use it and shut it down for an hour and when I return and turn my PC again this problem comes out... It is the small disk battery found on your motherboard. (it's probably this) = but sad to say it doesn't fix the problem still there.... T_T As dbarker suggested please post as much detail as requested.
CMOS is a circuitry design/chip while cmos battery (mostly CR2032 on computers) powers the cmos so that it can retain whatever data the cmos holds even when for example a PC (with the BIOS configuration) is turned off.
As to the OP's problem, maybe clearing cmos through a jumper on the motherboard might resolve the checksum error.