View Full Version : is this what happens when you have a flat batery

19-12-2002, 03:49 PM
"cmos/grnv checksum bad"
this message comes up when my cmos batterie goes flat

Graham L
19-12-2002, 03:59 PM
That is one of the things which happens. ;-) The checksum is a number generated when you have change the settings in the BIOS. It is written to the memory witht he settings. When the boot routines reads the settings, it recalculates the checksum, and compares it with the stored one. If the memory contents are lost because the voltage drops too low, there will usually be a difference, and the BIOS code says that this is a fatal error.

Some hardware will detect that the battery voltage is too low, and complain about it before things get lost. Sometimes the clock will drop out before the BIOS settings are lost.

19-12-2002, 03:59 PM
Yes, Tim, it indicates that there may be a problem with your battery. Some of us spent quite a bit of time on you here http://pressf1.pcworld.co.nz/thread.jsp?forum=1&thread=28839

Have you replaced the battery or talked to the shop about it?