My laptop monitor goes white

i bought my laptop about 6 moths ago, its sony, Vaio

and suddenly my monitor goes white and if i adjust the monitor it sometimes comes

back to normal

but i usually have to restart the laptop

can anyone tell me what the problem is?

and if i need to replace the LCD monitor can you tell me how much it will cost?
 
"can you check if its motherboard problem or just the monitor?"

This is a laptop srn3o,
No warranty available? If you plug in an external monitor and it works, the LCD display could be bad, but there still is a chance that the motherboard is bad too. If you shine a flashlight on the LCD screen, can you see anything on the screen?
 
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