Progress Electronics

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What is wrong with my computer? Monitor goes half black but returns to normal if I bang the desk with my hand.

I posted a similar question about a week ago, but at that time, the computer monitor was only getting "blips" or waves of a white line across the screen once in a while, and it would go immediately away. I tried unplugging everything, rebooting, moving the speakers and other electronics away, etc. and no luck. It has now progressed to where the screen will once in a while have the bottom turn black and the rest of the screen looks like a compressed version of the full screen with a lot of static. It will stay like this for a few minutes even if I turn off the monitor or if I restart the computer. It will go back to normal for no reason. I also found out accidentally that it will return right back to normal if I bang my fist on the desk next to the keyboard.

BEFORE YOU MESS WITH THIS, ARE YOU EXPERIENCED WITH HIGH VOLTAGE???? IF NOT, DO NOT OPEN THE CASE!!!

TURN IT OFF, let sit 5 min, THEN unplug it.
You have one of several possibilities:
1. loose card or chip. re-seat everything.
2. Verticle Deflection circuit has bad solder joint or loose component - try soldering anything suspicious-looking [cracks in runs, joints, etc].

Otherwise, go get an LCD as a replacement.