The Power Management Does Not Respond; My Lcd Screen Is Blank - Sony VAIO PCG-VX80 Series Quick Start Manual

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VAIO® Computer Quick Start
If your computer still does not turn off, press and hold the power button for
at least four seconds to turn off the power.
Unplug the computer from the AC adapter, and remove the battery pack
from your computer.
If your computer stops responding while playing a CD or DVD, press
Ctrl+Alt+Delete simultaneously. When the Windows Task Manager window
appears, click Shut Down, and click Turn Off from the drop-down list.
Pressing the Ctrl+Alt+Delete keys simultaneously or turning off the computer with
the power button may result in data loss in files that are currently open.

The power management does not respond.

Your computer's operating system may become unstable if a lower power state,
such as Hibernate, is initiated and changed before the computer completely
enters the lower power state.
To restore the computer to its normal operating stability
1
Close all open applications.
2
Restart the computer by pressing Ctrl+Alt+Delete simultaneously.
When the Windows Task Manager window appears, click Shut Down,
and click Restart from the drop-down list.
3
If this procedure does not work, press and hold the power button for
four seconds or longer to turn off the computer.

My LCD screen is blank.

Verify the computer is plugged into a power source and is turned on.
Verify the power indicator on the computer is on.
Verify the battery packs are inserted properly and are charged.
The computer may be in LCD (Video) Standby mode. Press any key to
activate the screen.
The display mode may be set to external display mode. Press and hold the Fn
key while pressing F7 several times.
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