Computer Powered Off Automatically And The Power Light Blinks Red Four Times And Then White Two Times; System Does Not Turn On And The Lights On The Front Of The Computer Are Not Blinking - HP ProDesk 400 G7 SFF Maintenance And Service Manual

Cause
Processor is too hot.
Hard drive is full.
Low on memory.
Hard drive fragmented.
Program previously accessed did not release reserved memory
back to the system.
Virus resident on the hard drive.
Too many applications running.
Some software applications, especially games, are stressful on the
graphics subsystem.
Cause unknown.
Computer powered 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.

System does not turn on and the lights on the front of the computer are not blinking

Use this information to troubleshoot the computer.
ENWW
Solution
1. Be sure that airflow to the computer is not blocked. Leave a
10.2 cm (4 inch) clearance on all vented sides of the computer
to permit the required airflow.
2. Be sure that fans are connected and working properly (some
fans only operate when needed).
3. Be sure that the processor heat sink is installed properly.
Transfer data from the hard drive to create more space on the hard
drive.
Add more memory.
Defragment hard drive.
Restart the computer.
Run virus protection program.
1. Close unnecessary applications to free memory.
2. Add more memory.
3. Some applications run in the background and can be closed by
right-clicking their corresponding icons in the task tray.
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.
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.
Solving general problems 53