Poor performance.Cause Solutionfor suggestions on how to improve performance byadjusting parameters in the application.2. Add more memory.3. Upgrade the graphics solution.Cause unknown. Restart the computer.Computer powered off automatically and the Power LED flashes red four times and then white two times.Cause SolutionProcessor thermal protection activated:A fan may be blocked or not turning.ORThe heat sink is not properly attached to the processor.1. Ensure that the computer air vents are not blocked and theprocessor cooling fan is running.2. Open the access panel, press the power button, and see ifthe processor fan (or other system fan) spins. If the fan doesnot spin, make sure the fan cable is plugged onto the systemboard header.3. If fan a plugged in and not spinning, replace it.System does not power on and the LEDs on the front of the computer are not flashing.Cause SolutionSystem unable to power on. Press and hold the power button for less than 4 seconds. If thehard drive LED turns white, then:1. If equipped with a voltage selector, check that the voltageselector (located on the rear of the power supply) is set tothe appropriate voltage. Proper voltage setting depends onyour region.2. Remove the expansion cards one at a time until the 5V_auxlight on the system board turns on.3. Replace the system board.ORPress and hold the power button for less than 4 seconds. If thehard drive LED does not turn on white then:1. Check that the unit is plugged into a working AC outlet.2. Open the access panel and check that the power buttoncable is properly connected to the system board.3. Check that the power supply cables are properly connectedto the system board.4. Check to see if the 5V_aux light on the system board isturned on. If it is turned on, then replace the power buttonassembly.5. If the 5V_aux light on the system board is off, then replacethe power supply.6. Replace the system board.68 Chapter 6 Troubleshooting without diagnostics
