Dell POWEREDGE 840 Hardware Owner's Manual page 110

4 Ensure that the processor and heat sink are properly installed. See "Installing a Processor" on page 81.
5 Close the system. See "Closing the System" on page 47.
6 Reconnect the system to the electrical outlet, and turn on the system and attached peripherals.
If the problem persists, see "Getting Help" on page 121.
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Troubleshooting Your System