Hi All, I have a Toshiba Satellite Pro labtop. Everytime i startup I get: 'Bad RTC Battery' 'Bad Check Sum (CMOS) 'Check System. Then press F1 key' after F1 is pressed, ESC and then y...windows startup fine and everything elses running fine except the date and time reset to default 01/01/2000 12:00AM Anyone knows how to fix this anoying problem??? Thanks. Jase

By the way i have changed the battery but still get Bad RTC battery Jase.

From a google search. Might be useful, good luck. From Toshiba's Knowledgebase : Issue When you turn your Toshiba computer on, you see an error message like: **** Bad RTC battery **** **** Bad Checksum (CMOS) **** Check system, then press [F1] key The Real Time Clock (RTC) battery provides power for the internal clock/calendar and for maintaining system configuration settings. This error can occur when a machine has been left turned-off for an extended period of time (around a month), and is the result of a depleted RTC battery. Other symptoms include not being able to execute Windows Update properly, errors/problems executing application software (like Norton Antivirus), and the appearance of the Windows XP "Desktop Clean Wizard". Resolution This condition is easy to fix in 3 basic steps: Reset the BIOS defaults Set the correct date and time in Windows. Charge the RTC battery Please follow the detailed instructions in the next section. Procedure Set BIOS defaults Press the [F1] key as instructed in the error message: **** Bad RTC battery **** **** Bad Checksum (CMOS) **** Check system, then press [F1] key In the BIOS setup screen press the [Home] key to restore the default values, then press the [End] key to save and exit, then the [Y] key to confirm and restart the system. Set the correct date and time in Windows As Windows starts-up, you may see an error message about an "Invalid System Time". Go ahead and click "OK" to clear the error dialog. Open the Windows Control Panel and open the "Date and Time" control by double-clicking its icon. Set the correct date and time, then click OK to save. Charge the Real Time Clock (RTC) battery To charge the RTC battery, connect the AC adapter and turn the computer on (both the DC IN and Power LEDs must be green). Leave the machine on for approximately 24 hours to ensure a full charge in the RTC battery. Please note that the RTC battery does not charge while the PC is turned off, regardless of whether the AC adapter is connected or not. Other Information: If, on subsequent reboots, the "Bad RTC Battery" error persists, it's quite likely that you actually do have a bad RTC battery. If that's the case, you should contact a Toshiba Authorized Service Provider to have the system serviced. Windows XP Desktop Cleanup Wizard The first time you reboot Windows XP after resetting the system clock, Windows XP may try to run the "Desktop Cleanup Wizard". Simply Cancel the "Desktop Cleanup Wizard" at the first dialog. If you do manage to clean your shortcuts from the desktop and want to recover them, you will find them in a folder called "Unused Desktop Shortcuts". You can recover them as follows: Double-click to open the "Unused Desktop Shortcuts" folder Click to expand the "Edit" menu, and click "Select All" Drag the selected items back to your desktop Close the "Unused Desktop Shortcuts" folder. You can delete this folder if it is empty.

thanks CrazyOne will give it ago...

Charging the RTC battery should solve it. Best of luck. WebKing, Windows XP Performance and Maintenance Articles