User's Manual

172 Solving Problems
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Basic Checks:
• Check the diagnostic lights to see if the specific problem is identified.
• If two microprocessors are installed, ensure that they are identical. The
computer may not start or function properly if two microprocessors are
installed that are not identical:
– Different cache sizes
– Different speeds
– Different steppings
– Different types
• If two microprocessors are installed, ensure that a VRM is installed for
each processor.
• If two microprocessors are installed, ensure that the VRMs are
identical. The computer may not start or function properly if two
VRMs are installed that are not identical.
• If a system message indicated a problem with one or both of the
microprocessors, the processor(s) may need to be replaced.
• If a system message indicated a problem with one or both of the
VRMs, the VRM(s) may need to be replaced.
• Run the System Board Devices and Processor Cache test groups in the
Dell Diagnostics.
• Reseat the microprocessors.
• Reseat the VRMs.
• Reconnect the cooling fan for each installed microprocessor.
• Restart the computer.
If the problem still exists after you complete the basic checks, fill out the
Diagnostics Checklist as you perform the following steps.
CAUTION: Before you perform this procedure, see "Safety First—
For You and Your Computer."