Each time the computer is booted, this value, which is a number is checked against the stored value in the CMOS memory.If these two values are different, it causes a CMOS Checksum error message.If the motherboard is damaged and is beyond repair, you would definitely need to consider buying a new laptop.This is of course necessary as the motherboard of a laptop is very expensive and not covered by a warranty, so the better option would be to buy a new laptop.
” So I booted into UBCD and tried my favorite BIOS password murdering tools like cmospwd. Every time I would reboot out of the tool it would error out at a BIOS checksum error and not let me get into the BIOS. Apparently the TPM chip stores the password and can restore it to the CMOS if it sees that it is gone. The first time I contacted HP they said I needed to drive 2 hours to an authorized vendor who I could pay to flash the TPM. So I waited about 4 months and then contacted them again. This time the chat support rep had someone from “HP Complex Problem Resolution & Quality” email me some cool instructions. As in–all the way dead, to where it can never charge again. When your Acer laptop doesn’t power up the problem could be worsened by leaving it plugged in. Yes, I know I just told you to make sure the battery works in number 1 but there is a reason for this. 3.) Next, unplug the power adapter from the wall AND from the computer .Take down the CMOS battery’s information such as volt, size, etc.
Replace the old battery with a new one and reenter the CMOS settings.
If these values are the same, the computer boots normally.