system cmos checksum bad - default configuration used.

Hi Joseph,

Since when are you facing this issue?

The error CMOS Checksum Bad **** that appears depends on the type of BIOS used. Any of these error conditions indicate that a Basic Input/Output System (BIOS) test failed.

There are two main reasons why a BIOS test fails:

·The battery on the motherboard has lost its ability to supply power. The system time and date are also affected by a bad battery.

**·**The BIOS was updated "incorrectly". This can happen if power is lost while updating the BIOS, or when the BIOS is updated with an update that was not downloaded from HP, or when a certain virus or malicious program modifies the BIOS data.

To resolve the error, use one of the following **sections** provided by HP.

Note: Modifying BIOS/ complementary metal oxide semiconductor (CMOS) settings incorrectly can cause serious problems that may prevent your computer from booting properly. Microsoft cannot guarantee that any problems resulting from the configuring of BIOS/CMOS settings can be solved. Modifications of the settings are at your own risk.

If your PC still displays errors about the clock or CMOS when starting the PC, the CMOS battery on the motherboard probably needs to be replaced.

You may also contact **** **HP** for help.