Sony VAIO PCG-R505ELK User Manual page 174

Troubleshooting the LCD Screen
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 pack(s) is inserted properly and is 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 the F7 key several
times.
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