HP Pro 2000 - Microtower PC Maintenance And Service Manual page 105

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.
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.
Solving Hardware Installation Problems 97