Sony PCG-GRX580P - Manual (Page 143)

Troubleshooting the LCD Screen
My LCD screen is blank.
 Check that the notebook is plugged into a power source and that it is turned on.
 Check that the power indicator on the notebook is on.
 Check that the battery pack is inserted properly and that it is charged.
 The notebook 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.
Page 143