Dell POWEREDGE 840 - Manual (Page 110)

110
Troubleshooting Your System
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.