HP EliteDesk 705 G1 Microtower Maintenance And Service Manual page 139

Poor performance.
Cause
Some software applications, especially games, are stressful
on the graphics subsystem.
Cause unknown.
Computer powered off automatically and the Power LED flashes Red two times, once every second, followed by a two
second pause, and the computer beeps two times. (Beeps stop after fifth iteration but LEDs continue flashing).
Cause
Processor thermal protection activated:
A fan may be blocked or not turning.
OR
The heat sink is not properly attached to the processor.
System does not power on and the LEDs on the front of the computer are not flashing.
Cause
System unable to power on.
Solution
d. On the Startup tab of the System Configuration
Utility, clear applications that you do not want to
launch automatically, and the click OK.
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. Ensure 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, make sure the fan cable is
plugged onto the system board header.
3. If fan a plugged in and not spinning, replace it.
Solution
Press and hold the power button for less than 4 seconds. If
the hard drive LED turns white, then:
1. If equipped with a voltage selector, check that the
voltage selector (located on the rear of the power
supply) is set to the appropriate voltage. Proper voltage
setting depends on your region.
2. Remove the expansion cards one at a time until the
5V_aux light on the system board turns on.
3. Replace the system board.
OR
Press and hold the power button for less than 4 seconds. If
the hard 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 button
cable is properly connected to the system board.
3. Check that the power supply cables are properly
connected to the system board.
Solving general problems 129