http://h10032.www1.hp.com/ctg/Manual/c03565509
Clearing Passwords
1. Turn off the computer and disconnect the power cord from the power outlet.
2. Remove the access panel.
3. On the system board, locate the CLR_PASS header.
4. Remove the jumper from pins 2 and 3.
5. Place the jumper on pins 1 or 2.
6. Replace the jumper on pins 2 and 3.
7. Replace the chassis access panel and reconnect the power cord.
8. Turn on the computer and allow it to start.
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