F2
Did you try F10 at the compaq start screen? Mine is a 6000 but F10 works for mine This document pertains to Compaq Presario Desktop PCs.The Basic Input/Output System (BIOS) contains the code required to control the basic hardware associated with the computer, such as keyboards, display screens, and disk drives. The BIOS is generally used for disabling or enabling devices or device functions. Changes in the BIOS affect the computer even before the operating system has a chance to recognize the device.Use the following instructions to open the BIOS:# Press the Power button to start the computer.NOTE: Pressing F10 opens the BIOS of Compaq Presario desktops 2001 and earlier.Pressing F1 opens the BIOS of the S3000 series, 6400 series, and 2002 models of Presario desktop computers.# Immediately press the F10 or F1 key repeatedly on the keyboard when the logo screen displays.Figure 1: logo screen# If a language selection screen appears, select a language and press Enter .Figure 2: Example of BIOS page (in English)
F10 on the splash screen apparently enters the BIOS. Search hp.com for the model and download the manual, it will be in there.
The CMOS RAM, or computer motherboard operation system with rapid access memory can be accessed through the bios during startup. Typically repeatedly pushing the key F10 with give access.
There are three ways to clear the CMOS on a computer. You can access the BIOS menu and reset the BIOS settings, you can use the motherboard jumper or clear it by reseating the CMOS battery.
Assuming you mean "flash the CMOS", when the CMOS settings are so messed up, you cannot access the BIOS.
After taking apart the laptop (see instructions at http://www.takeitapart.net/forum/index.php/topic,5.0.html) I found there is a CMOS battery under the keyboard, but it is soldered to the motherboard. This doesn't make it useful as a reset. I did not find a jumper or any other reset switch internal to the laptop. My research seems to suggest that holding the power button for 30 seconds is supposed to reset the CMOS. Unfortunately, that did not help in my case, but may for yours. Regards, JC -- www.cippguide.org
Most likely the small battery inside the case that powers CMOS RAM needs replacing.
The Del key
In the start up process when the system is verifying components press f1, or f8..., and you can get access to the BIOS setup.
To access and modify the CMOS data, you would need a CMOS setup utility. Originally, in the IBM AT and a few close clones, it required a separate utility on a diskette. However, manufacturers soon added this utility the the ROM BIOS. So even today, all you have to do is enter CMOS setup is to press a certain day upon booting the system. Delete, F1, and F2 are some of the common keys to use for entering the CMOS setup utility.
You do it in CMOS setup, usually by pressing F2 during bootup, but the exact key combination varies from device to device.