I have Acer Aspire 5920G laptop with following symptoms.

01. When I pressed power button it takes 3 seconds to turn on.
02. Acer logo displayed and within 4 seconds screen become white color.
03. If I leave it with white screen for few munites then immediately I pressed power button screen goes white.
04. It I let the laptop off for few minutes again Acer logo shows but within seconds screen become fully white.
05. Laptop boot into windows with that white screen and can hear windows sounds.

Graphic card seems fine, Screen checked - OK (its working)

What would be the problem?

P.S. when plugged into an external monitor can see the desktop. which means graphic card is working.

LCD panel, cable matrix

Nvidia GF8600GT card was the problem. Someone reflowed it and cleaned well. Therefore I couldn't figured it was reflowed. I ordered new 2011+ chip for replacement and now everythings fine. Thanks