Laptop screen suddenly turns black but the computer is still on.

Since I bought my ASUS VivoBook Pro N552VX I started having the following problem: on normal usage, the screen will go black, although it keeps the backlighting, while the computer keeps running without display. That can be seen on the small display lights that indicate operation, and facts such as music still playing. Since the screen will not display any information, it impossible to navigate through the device and therefore the only way which allows the computer to properly work again is to force a restart through the power button.

Since it is still in warranty period, I've sent it for repair already 3 times being them unable to find any error. Graphic drivers as well as Windows have been updated several times in this time, with none of them fixing the problem, which does not follow any pattern at all: it may not happen in some weeks, then it might happen several times in a day. It is not related to the computing power demand on the PC, or any other similar factor. Sometimes it happens after a period of having left it turned on without using it, but other times it just happens randomly while I am watching a video or doing anything else. If I have it connected to an external monitor, then both screens go black.

I really hope someone can help me here! Thanks!

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