CMOS/GPNV Checksum Bad

[Butterfly Bill]

When I turn on the computer, I get the black screen with old-time DOS
letters that say, among other things:

CMOS/GPNV Checksum Bad

This was intermittent for a while, now it's becoming constant.

When I "Press F2 to load default values and continue", I have to
reset the clock all over again. It usually comes on set on Feb. 5, 2002
which is approximately the time I first had XP installed (I don't
remember exactly). But sometimes it is other years, like 2096.

And I think related to this might be that my Norton Anti-Virus keeps
giving me the window saying my subscription is expired, even tho I
renewed it last May, and I occasionally see the little window in the
lower right corner saying "Your (blah blah)s have been updated"

I have messed with CMOS chips from Radio Shack like the 4049 hex
inverter and the 4013 dual flip flop, so I am surmising that this is a
hardware problem.

Can somebody fill in the blanks?

-Butterfly Bill

 

[Kenny]

Change the motherboard battery.

 

[Malke]

When I turn on the computer, I get the black screen with old-time DOS
letters that say, among other things:

CMOS/GPNV Checksum Bad

This was intermittent for a while, now it's becoming constant.

When I "Press F2 to load default values and continue", I have to
reset the clock all over again. It usually comes on set on Feb. 5,
2002 which is approximately the time I first had XP installed (I don't
remember exactly). But sometimes it is other years, like 2096.

And I think related to this might be that my Norton Anti-Virus keeps
giving me the window saying my subscription is expired, even tho I
renewed it last May, and I occasionally see the little window in the
lower right corner saying "Your (blah blah)s have been updated"

I have messed with CMOS chips from Radio Shack like the 4049 hex
inverter and the 4013 dual flip flop, so I am surmising that this is a
hardware problem.

Usually this means that you need to replace the little battery on your
motherboard. The cost is very low, around $3-5 USD and very simple to
do.

How To Replace The CMOS Battery In Your PC -
http://www.liverepair.com/encyclopedia/articles/cmosreplace.asp

How to replace the CMOS battery -
http://www.computerhope.com/issues/ch000239.htm

When was the last time you thought about the battery in your PC? -
http://home.i-plus.net/jtmurphy/cmos.htm

Malke

 

[Jonny]

Since "turning on the computer" seems to mean alot of things in this
particular newsgroup, I'll rephrase it. When first applying power to the
PC, you get the message noted in the header/subject line.
The message means the data in NVRAM is not what's expected. It can be the
cmos battery, or it can be the nvram itself in the RTC of the motherboard.