Sony Vaio Vgn Sr390 No Display How To Diagnose Sony Laptop

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sony vaio VGN-SR390 no display only green power light, after replacing thermal paste on processor and gpu

My VAIO Notebook Computer Screen Has No Display Turn off your computer. Unplug the AC adapter and remove the battery. Press and hold the power button, or slide and hold the power switch for 30 seconds. Insert the battery and plug the AC adapter back in. Press or slide the power button. Regards, Will