BIOS Updates
HP periodically releases system BIOS updates, which are available from the HP website. These updates
often contain fixes for known issues in the BIOS.
To find out whether a PC needs a BIOS update, compare the current BIOS version number against the
latest version available for download. To determine the current BIOS version, you should perform the
following steps:
1. Click Start > Shut Down.
2. Select Restart, and then click OK.
3. When the first screen displays, press F10 to enter Setup. The BIOS revision number is listed on
the main menu.
4. Write down the current BIOS version.
5. Exit Setup by pressing Esc, selecting Yes, and pressing Enter.
Clearing CMOS
The CLEAR CMOSjumper allows you to clear the Real Time Clock (RTC) RAM in CMOS. You can clear
the CMOS memory of date, time, and system setup parameters by erasing the CMOS RTC RAM data.
The onboard button cell battery powers the RAM data in CMOS, which include system setup information
such as system passwords.
To erase the RTC RAM:
WARNING! Except when using this function, do not remove the jumper cap from the default position
or else there may be a system boot failure.
1. Turn off the computer and disconnect the power cord.
2. Remove the RTC battery.
3. Disconnect the keyboard, monitor, and any other external devices that are connected to the
computer.
4. Remove the access panel.
5. Locate the CMOS jumper header on the motherboard, as follows:
●
On model 500B it is labeled E18.
●
On model 505B it labeled CLEAR CMOS.
66 Appendix B Diagnostics
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