I just bought a used ASUS A7N266-VM board. Everything seems to be great...except for one thing: The keyboard, which works elsewhere, doesn't power up like it should with this board's boot-up. The boot-up sequence hangs at the CMOS checksum error message. If this motherboard allowed my keyboard to work, then I could get into the BIOS and make the necessary adjustments.

SOURCE: Bad BIOS checksum.... CMOS bad checksum errors

u need to chnage the c-mos battery>and try this first unplug teh c-mos battery and replug it and check if its not works then chnage it rate me solved if its helps thx

SOURCE: CMOS Checksum Bad

bios update might fix the problem http://support.asus.com/download/download.aspx?SLanguage=en-us

if da above link doesnt work check dis alternate link but i am sure it'll work

http://drivers.softpedia.com/get/Other-DRIVERS-TOOLS/Asus/Asus-P4P800-SE-Afudos-BIOS-update-tool-226.shtml

Steve Si

• 395 Answers
• Posted on Aug 08, 2008

SOURCE: Asus P4B Motherboard

Press DEL to enter setup and set Reset to Defaults in Exit menu. If you have USB keyboard, make sure you enable Legacy USB and USB keyboard settings, save and exit and reboot.

SOURCE: I want to download driver cd ASUS A7N266 VM

i want to download drivers

SOURCE: Asus motherboard( A7N266-VM)

FOr reset motherbord settings to defaults you can reset with 2 methods.
(1)Pull cmos cell from motherbord for 10 minutes so all settings defaults.
(2) Find jumper on motherbord named "Clear cmos" It has 1-2-3 pins.Put jumper in 2-3 position and thne power up then again put pin in 1-2 position thne all settings defaults.
Refix RAM memory.Clean dust from all parts.
Open processor and processor fan.
Remove pci cards from motherbord then check.
Make sure motherbord not ground with cabinet.
Let me know if you need further assistance.