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I have an HP Compaq Presario CQ61-310SD Notebook. And when I start my computer on the highest brightness, my screen would go dark after a few seconds. I can hear that moment that it goes dark.

I've formatted/reinstalled drivers and stuff. But still I can't seem to figure out what's wrong.

The thing is when I start the notebook with a lower brightness, it will work for 10 minutes or so but then just the same problem..

I can use an external monitor / vga cable, and that works..

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What can you hear when the screen goes dark? Does the screen come back on or does it remain dark? –  Dave Sep 18 '13 at 14:53
    
It remains dark. And i hear something bzzzzz when it's going to dark out. –  Kets Sep 18 '13 at 15:05
    
One of my friends came to me with this exact same issue and the exact same laptop a couple days ago. I wasn't able to help him. I think there is a bad batch of back lights in this models screen. The issue does not seem to originate from software at all. –  Jason Bristol Sep 18 '13 at 17:04
    
Do you have the Power Saver option selected on the Laptop's Power Options? –  Yass Sep 18 '13 at 17:33
    
Boot into the BIOS and see if the screen still goes dark after X amount of time. You may be able to eliminate the OS causing this issue. –  YiweiG Sep 18 '13 at 18:28

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