4. Ensure that each expansion card is firmly seated in its connector.
5. Install the system cover.
6. If the problem is not resolved, turn off the system and attached peripherals, and disconnect the
system from the electrical outlet.
7. Remove the system cover.
8. Remove all expansion cards installed in the system.
9. Install the system cover.
10. For each expansion card you removed in step 8, perform the following steps:
a. Turn off the system and attached peripherals, and disconnect the system from the electrical
outlet.
b. Remove the system cover.
c. Reinstall one of the expansion cards.
d. Install the system cover.
e. Run the appropriate diagnostic test. For more information, see Using System Diagnostics.
Troubleshooting processors
CAUTION: Many repairs may only be done by a certified service technician. You should only
perform troubleshooting and simple repairs as authorized in your product documentation, or as
directed by the online or telephone service and support team. Damage due to servicing that is
not authorized by Dell is not covered by your warranty. Read and follow the safety instructions
that came with the product.
1. Run the appropriate diagnostics test. See Using System Diagnostics for available diagnostic tests.
2. Turn off the system and attached peripherals, and disconnect the system from the electrical outlet.
3. Remove the system cover.
4. Ensure that the processor and heat sink are properly installed.
5. Install the system cover.
6. Run the appropriate diagnostic test. For more information, see Using System Diagnostics.
Error Messages

Errors That Halt the System Completely

The following is a list of BIOS error messages that will halt the system completely requiring you to cycle
the system’s power:
• Error! Memory configured incorrectly. Please enter Setup for Memory Information details
• Alert! Processor Cache Size Mismatch.
• Alert! Processor Type Mismatch.
• Alert! Processor Speed Mismatch.
• Alert! Incompatible Processor Mismatch.

Errors That Soft Halts the System

The following is a list of BIOS error messages that will cause a soft halt of the system and then the user
will be prompted to press F1 to continue or F2 to enter the system setup:
• Alert! Air temperature sensor not detected.
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