Screen started to have some white lines across, that disappeared when I moved the screen. problem got worse as time went on, today the screen showed double images and computer did not react to mouse / pad. when finally I found a correct angle of the screen and fixed in place, the laptop went back to normal, and I backed all my stuff up quickly.
Could that be a problem with the connection between screen and whatever it's connected to inside? like a broken cable that shorts out and confuses the poor thing?
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It's usually the lcd cable. It has a short so when you move the screen back and forth you're "fixing" it.
Best thing to do is just look up the part number on the lcd wire and buy a replacement one on ebay. If that doesn't fix the problem it's the lcd, but based on what you've described all signs point to lcd cable.
check the video cable
and see if it;s properly seated.
run the laptop with something that uses memory. if the video chip it going to show signs of problems, it will be more prominent when the laptop gets hot.
most cases laptop motherboards have integrated video cards and cannot be replaced.
It could be a problem with an internal connection. A quick test and perhaps even fix would be to grasp the right and left sides of your display while it is on (displaying the offensive lines) and gently twist like you were wringing out a towel. Again, and I emphasize, gently using only a couple of ounces of force. Watch to see if the lines disappear, get worse of make the screen flash or change. If you do then its likely cause is the connector from the LCD panel to the electronics has oxidation or a loose connection. If you?re lucky the flexing might even fix your problem, if not you will have to take it apart to find out exactly what is going on.