HP Pro 4500 Maintenance & Service Guide: HP Pro 4500 Microtower Business P - Page 86

Computer will not start. - review

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Computer will not start. Cause Wrong memory modules were used in the upgrade or memory modules were installed in the wrong location. Solution 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: DIMM2 must always be installed. 2. Listen for beeps from the computer. Beeps are codes for specific problems. 3. If you still cannot resolve the issue, contact Customer Support. The computer emits one short beep then one long beep followed by a three second pause. 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. 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. The computer emits two short beeps then one long beep followed by a three second pause. Cause Solution Graphics card 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. 78 Appendix B Troubleshooting Without Diagnostics

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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:
DIMM2 must always be installed.
2.
Listen for beeps from the computer. Beeps are codes for
specific problems.
3.
If you still cannot resolve the issue, contact Customer
Support.
The computer emits one short beep then one long beep followed by a three second pause.
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.
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.
The computer emits two short beeps then one long beep followed by a three second pause.
Cause
Solution
Graphics card 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.
78
Appendix B
Troubleshooting Without Diagnostics