Don't reset password BIOS HP DC7100

If you cannot access the machine after if has been powered up, it is still possible to get past the BIOS password. The BIOS password is stored in CMOS memory that is maintained while the PC is powered off by a small battery, which is attached to the motherboard.

Open the CPU casing locate the CMOS battery in motherboard and remove this battery, all CMOS information (including the BIOS password) will be lost. You will need to re-enter the correct CMOS setup information to use the machine. The machines owner or user will most likely be alarmed when it is discovered that the BIOS password has been deleted.

On some motherboards, the battery is soldered to the motherboard, making it difficult to remove. If this is the case, you have another alternative. Somewhere on the motherboard you should find a jumper that will clear the BIOS password. If you have the motherboard documentation, you will know where that jumper is. If not, the jumper may be labeled on the motherboard. If you are not fortunate enough for either of these to be the case, you may be able to guess which jumper is the correct jumper.

This jumper is usually standing alone near the battery. If you cannot locate this jumper, you might short both of the points where the battery connects to the motherboard.

If all else fails, you may have to clear the BIOS password by resetting the RTC (Real Time Clock) IC (Integrated Circuit) on your motherboard.
Many RTC's require an external battery. If your RTC is one of this type, you can clear the BIOS password just by unsocketing the RTC and reseating it. Good luck!

For that open cpu cabinet then pull cmos cell for 10 minutes.
Also you can clear password with jumper settings find jumper on motherbord named "CLEAR CMOS"
it has 3 pin set it to 2-3 position then power up then again set it to 1-2 position then it not ask for password.
Let me know if you need more assistance.,
Thanks.

For that open cpu cabinet then pull cmos cell for 10 minutes.
Also you can clear password with jumper settings find jumper on motherbord named "CLEAR CMOS"
it has 3 pin set it to 2-3 position then power up then again set it to 1-2 position then it not ask for password.
Let me know if you need more assistance.,
Thanks.