HP ProDesk 600 G1 Tower Maintenance And Service Manual page 181

Power LED flashes Red five times, once every second, followed by a two second pause, and the
computer beeps five times. (Beeps stop after fifth iteration but LEDs continue flashing.)
Cause
Memory is installed incorrectly or is bad.
Power LED flashes Red six times, once every second, followed by a two second pause, and the computer
beeps six times. (Beeps stop after fifth iteration but LEDs continue flashing.)
Cause
Graphics card (some models) is not seated properly or is bad,
or system board is bad.
Power LED flashes Red ten times, once every second, followed by a two second pause, and the computer
beeps ten times. (Beeps stop after fifth iteration but LEDs continue flashing.)
Cause
Bad option card.
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 module.
1.
Reseat DIMMs. Power on the system.
2.
Replace DIMMs one at a time to isolate the faulty
module.
NOTE:
DIMM1 or XMM1 must always be installed.
DIMM1 must be installed before DIMM2, and DIMM3
must be installed before DIMM4
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.
Solution
1.
Check each option card by removing the cards one at
time (if multiple cards), then power on the system to see if
fault goes away.
2. Once bad card is identified, remove and replace bad
option card.
3. Replace the system board.
Solving Hardware Installation Problems
171