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Computer will not start.
Cause Solution
Wrong memory modules were used in the upgrade or
memory modules were installed in the wrong location.
1. Review the documentation that came with the system to
determine if you are using the correct memory modules
and to verify the proper installation.
NOTE: DIMM1 or XMM1 must always be installed. On
all computers except the USDT, DIMM1 must be
installed before DIMM2, and DIMM3 must be installed
before DIMM4.
2. Observe the beeps and LED lights on the front of the
computer. Beeps and flashing LEDs are codes for
specific problems.
3. If you still cannot resolve the issue, contact Customer
Support.
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 Solution
Memory is installed incorrectly or is bad. 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. On
all computers except the USDT, 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.
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 Solution
Graphics card (some models) is not seated properly or is
bad, or system board is bad.
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.
170 Appendix D Troubleshooting Without Diagnostics