Thin Black Vertial lines Help

My macbook pro is just over a year and a half old. The past few days it has been acting a little strange. All of a sudden these think black vertical lines apear and slowly move in a upwards motion like it is filling back in after the screen refreshes. Also you get shadows of boxes that have been there but have moved. When this happens the computer usually is really hot and at 100% processes. Also the process syslogD keeps on popping up at using all my processing.
Does anyone have an idea of what caused this? I haven't done anything different with my computer then usual.
Thanks!

Since the Apple Store folks could not replicate the problem, you may want to consider a cause that is part of your particular environment.
For example, if you use a power strip (surge suppressor), what else is connected to the same power strip? Is it possible that you may have too many power-hungry devices connected to the same single wall outlet, and the iMac is not getting sufficient power? Or maybe it's some electrical interference with another device on the same circuit? As a test, try disconnecting everything else, and see if the problem recurs, or connect the iMac directly to a wall outlet by itself to see if the problem recurs.
Try moving the iMac to a different location in your home and running it to see if the problem recurs.

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Since the Apple Store folks could not replicate the problem, you may want to consider a cause that is part of your particular environment.
For example, if you use a power strip (surge suppressor), what else is connected to the same power strip? Is it possible that you may have too many power-hungry devices connected to the same single wall outlet, and the iMac is not getting sufficient power? Or maybe it's some electrical interference with another device on the same circuit? As a test, try disconnecting everything else, and see if the problem recurs, or connect the iMac directly to a wall outlet by itself to see if the problem recurs.
Try moving the iMac to a different location in your home and running it to see if the problem recurs.

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