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Maintenance and Service Guide
Compaq Presario 4900, 5000, & 5100 Series Computers

Home Product Description Troubleshooting Illustrated Parts Catalog
Removal & Replacement Jumper & Switch Information Specifications

Clearing CMOS
Power-On Self Test (POST)
Configuration
Diagnostic error codes
Troubleshooting without diagnostics
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TROUBLESHOOTING

Clearing CMOS

 

If the power-on password is unknown, clearing CMOS will disable the password and allow the computer to be operated. 

The board shown is one used for the 5000/5100 Series computers. If you have a 4900 Series computer, click the link for the correct board and CMOS location.

b4.gif (26897 bytes)

CMOS jumper location

1 Complete the preparation for disassembly procedures.
2 Remove the hood.
3 Remove the fax/modem board.
4 Open the system board bracket.
 
NOTE: If your board is different from the one shown, click here to see two alternative boards used on 5000/5100 Series computers.
5 To disable the password, move the jumper bub1.gif (838 bytes) (J22) from pins 1-2 to pins 2-3 for 10 seconds, then return to pins 1-2.
6

Replace the system board bracket and perform the desired troubleshooting.

 
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