Hi
The issue looks like the BIOS chip is corrupted, however before you take the unit to Repair center you may try the steps below.
1. Shut down turn off the computer and disconnect the power cord from the power outlet.
2. With the power cord disconnected, press and hold the power button for about 30 Seconds to drain the any residual power.
3. Remove the access panel.
4. Locate the header and jumper
5. Remove the jumper from pins 1 and 2.
6. Place the jumper on either pin 1 or 2, but not both, so that it does not get lost.
7. Replace the access panel and reconnect the external equipment.
8. Plug in the computer and turn it on. This clears the current passwords and settings.
9. Shut down the computer, unplug the power, and disconnect the external equipment
10. Remove the access panel.
11. Place the jumper on pins 1 and 2.
12. Replace the access panel.
13. Reconnect the external equipment and plug in the computer.
You may refer pages 249 to clear the password/ settings using jumpers referring document link below:
http://h20628.www2.hp.com/km-ext/kmcsdirect/emr_na-c04331008-1.pdf
Hope this helps, for any further queries reply to the post and feel free to join us again.
- Though I am an HP employee, I am speaking for myself and not for HP