Solving power problems
Common causes and solutions for power problems are listed in the following table.
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.)
Processor thermal protection activated:
A fan may be blocked or not turning.
The heat sink is not properly attached to the processor.
Solving audio problems
If the computer has audio features and you encounter audio problems, see the common causes and solutions
listed in the following table.
Sound cuts in and out.
Processor resources are being used by other open applications.
Sound does not come out of the speaker or headphones.
Software volume control is turned down or muted.
Audio is hidden in Computer Setup.
The external speakers are not turned on.
Computer is in Sleep state.
Internal speaker is disabled in Computer Setup.
The application is set to use a different audio device than
Chapter 6 Troubleshooting without diagnostics
Ensure that the computer air vents are not blocked and the
processor cooling fan is running.
Open the access panel, press the power button, and see if
the processor fan spins. If the fan does not spin, make sure
the fan cable is plugged onto the system board header.
If fan is plugged in and not spinning, replace it.
Shut down all open processor-intensive applications.
Double-click the Speaker icon on the taskbar, then make sure
that Mute is not selected and use the volume slider to adjust the
Enable the audio in Computer Setup: Advanced > Built-in Device
Turn on the external speakers.
Press the power button to resume from Sleep state.
When attempting to resume from Sleep state, do not
hold down the power button for more than four seconds.
Otherwise, the computer will shut down and you will lose any
Enable the internal speaker in Computer Setup. Select Advanced >
Built-in Device Options.
Some graphics cards support audio over the DisplayPort
connection (if applicable), so multiple audio devices may be listed
in Device Manager. Make sure the correct device is being used.
To access Device Manager in Windows 10, type device
manager in the taskbar search box, and then select Device
Manager from the list of applications.