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HP Dv4 Black Screen

I have a HP DV4 that seems to have a problem that alot of people are having.. however the things that fix theirs doesn't work with mine.

I turn on the laptop and all of the LED lights glow and stay solid. The caps lock and number lock blink.. but it does so infinitely. There is no 3 blinks or 4 blinks. It just blinks over and over again.

I plugged it into an external monitor and theres still no display. I've swapped the memory, hard drive and everything else to no avail.

What, likely, is the problem? Could it be the motherboard.. or maybe the graphics card. I'm not sure what to do..

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