Please help!!!

My hp laptop turns black, the computer itself is running, but the screen is black!

What could it be? How can i fix the problem?

I recently took it to a tech place where they clean and restart computers but the problem still exists.

What should i do?

You need to provide more information on when this occurs (what happens leading up to it) and what have you already tried to recover from it. If you took it to a technician, did you ask him to fix this problem and if so, what did he tell you? If it isn't fixed why not take it back to him?

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