Dell PowerEdge C5220 Hardware Owner's Manual page 102

Electrical Short or Overload
Remove non-essential items such as extra controller cards or IDE/ATAPI
devices to check for shorts and over-loads. If the system boots correctly, there
may be a short or overload associated with one of the components. Replace
each of the non-essential items one at a time to isolate which one is causing
the problem.
If the problem occurs even after removing the non-essential components, the
problem has to be with the system board, power supply, memory, or processor.
Defective Components
Defective components, especially processor and memory, can cause system
boot issues.
• Swap the memory modules with known good memory. Verify correct
operation of the suspected memory in a known working system.
• Swap the processor with a known good processor. Verify correct operation
of the suspected processor in a known working system.
System Does Not Boot After Configuration Changes
Hardware Changes
If the system does not boot after making changes to hardware or adding new
components, verify that the component installed is compatible with the
system.
Software Changes
If you recently installed new software or new device drivers, try booting into
Safe Mode and uninstall the new software or driver.
If you can now boot normally, there may be a compatibility issue between the
new software or driver and some component in your system. Contact the
software manufacturer for assistance.
BIOS Changes
Changes to some advanced BIOS settings (such as those found in the
"Advanced Menu" on page 24) can cause boot issues. Changes to Advanced
BIOS settings should only be made by experienced users.
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Troubleshooting