The screen of my HP pavilion gets all grainy and psychedelic research. Is it software or hardware

the computer is a pavilion dv7

So we know that this is the connector on the motherboard back to the screen. It could be the cable has been pinched or crushed, but moving the screen back and fourth usually changes the display if it is the problem (the exception is if a thread has completed severed).  The inverter blackens usually just the screen when it fails. This leaves us with the screen is probably bad.  Try laptopscreens.com.  They have videos on how to replace the screens and I believe they offer a service installation.  If your laptop is still under warranty, contact HP customer care and try to get a replacement or repair order.

Tags: Notebooks

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