HP Elite 7000 - Microtower PC Maintenance And Service Manual page 108

Table C-10 Solving Hardware Installation Problems (continued)
The computer emits one short beep then one long beep followed by a three second pause.
Cause
Memory is installed incorrectly or is bad.
The computer emits two short beeps then one long beep followed by a three second pause.
Cause
Graphics card is not seated properly or is bad, or system board
is bad.
100 Appendix C Troubleshooting Without Diagnostics
Solution
CAUTION: To avoid damage to the DIMMs or the system
board, you must unplug the computer power cord before
attempting to reseat, install, or remove a DIMM.
1. Reseat DIMMs. Power on the system.
2. Replace DIMMs one at a time to isolate the faulty module.
NOTE: DIMM2 must always be installed.
3. Replace third-party memory with HP memory.
4. Replace the system board.
Solution
For systems with a graphics card:
1. Reseat the graphics card. Power on the system.
2. Replace the graphics card.
3. Replace the system board.
For systems with integrated graphics, replace the system
board.