Diagnosing and recovering from problems 10-7Solving hardware and software problemsSolving hardware problemsTable 1: Hardware problemsIf the problem is: Here's what to do:Screen is black (no errorcode); beep during poweron self-test (POST).If you installed memory modules or adapter cards, makesure you installed them correctly. For instructions oninstalling memory modules on your system board, see”Installing memory modules” on page 9-9. For instructionson installing adapter cards in your system unit, see ”Addingand removing adapter cards” on page 8-4.Error code (anddescription), more thanone beep in self-test, orcontinuous beep occursIf an error code or message appears, refer to the section”Error codes and messages” on page 10-17.Computer turns off withoutwarning1. If mouse movement wakes the monitor, your monitorwas in standby.2. If computer power on light is blinking, your system is inStandby mode. Press the power on button to take thesystem out of Standby mode.3. Make sure that the system unit and monitor powercords are securely plugged into electrical outlets.4. Make sure that the cables are correctly and securelyconnected to the system unit.5. Check for a blown fuse, tripped circuit breaker, orpower failure.6. Unplug the system unit power cord from the electricaloutlet, wait 10 seconds, and then plug the power cordback into the electrical outlet. If the computer does notstart immediately, push the power button on thesystem unit.7. If you have added hardware inside the system unit,make sure the power cable connectors are securelyattached.Note: If any of these problems continue after taking the actions listed, see "HelpWaresupport and services" on page 2-1 for information on obtaining service.
