HI. I ve a NEC versa pro VA12J. When i start my laptop it starts with beep sound and shows BIOS screen with an error message: 0251: system CMOS checksum bad- default configration used. During this period,...
This "0251" error indicates that the CMOS (complementary metal-oxide semiconductor; a memory chip that holds data the computer needs each time it starts, such as the current time and the BIOS [Basic Input/Output System]) has become corrupted or damaged, typically because of one of these three reasons: A BIOS update has gone awry, a recently installed program incorrectly modified the BIOS, or the computer battery is running out of power.
If you recently upgraded the BIOS, the first thing you should do is edit the BIOS settings. The BIOS developer can help you access the BIOS Setup utility and configure the BIOS accordingly. Likewise, if you recently installed a program that may have modified the BIOS, contact the software developer for assistance in reconfiguring the BIOS for the new program.
If you did neither of these things, the culprit is probably a faltering battery. You can probably replace the battery on your own, but the process varies widely depending on the type and age of the computer. We suggest consulting the documentation that came with your computer or contact the computer manufacturer to determine the type of battery involved, where to purchase a new one, and how to replace it. You can also access the BIOS Setup utility and write down the BIOS settings to reconfigure the BIOS correctly after installing the replacement battery. Once the new battery is in place, you will have to reconfigure the BIOS and reset the system time, but the error message shouldn't appear again.
hope this helps
Jan 09, 2011 |
NEC Laptop Motherboard (1580262530)