Sony VGN-FJ370P - Manual (Page 115)

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Troubleshooting
What should I do if the power indicator (Green) lights but my computer screen stays
blank?
Follow these steps:
1 Press the power button for more than four seconds to check that the power indicator goes out. Then turn on your computer
again.
2 If your computer screen still stays blank, unplug the AC adapter, remove the battery, and leave the computer for about a
minute. Then plug in the AC adapter, install the battery, and turn on the computer again.