HP Pro Tower 400 G9 PCI Desktop PC Maintenance and Service Guide - Page 59
Computer turned off automatically and the power light blinks red four times and then white two times
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Some software applications, especially games, are stressful on the graphics subsystem. Cause unknown. 1. Lower the display resolution for the current application or consult the documentation that came with the application for suggestions on how to improve performance by adjusting parameters in the application. 2. Add more memory. 3. Upgrade the graphics solution. Restart the computer. Computer turned off automatically and the power light blinks red four times and then white two times Use this information to troubleshoot the computer. Cause Processor thermal protection activated. A fan might be blocked or not turning, or the heat sink is not properly attached to the processor. Solution 1. Be sure that the computer air vents are not blocked and the processor cooling fan is running. 2. Open the access panel, press the power button, and see if the processor fan (or other system fan) spins. If the fan does not spin, be sure that the fan cable is plugged onto the system board header. 3. If fan a plugged in and not spinning, replace it. System does not turn on and the lights on the front of the computer are not blinking Use this information to troubleshoot the computer. 52 Chapter 5 Troubleshooting without diagnostics