IMac 2010 Graphic issue? Can't Figure Out

Okay.... this week we noticed our 24" iMac might be having graphic issues.
we have re-paired permission, reset P-RAM and trash preferences.... but still having the same issue.
we are losing some graphic contrast in the background of each finder or itunes.
in iTunes or Finder, we used to get a seperation between each line via light blue color and white.
now it's all white. i can still see the blue lines if I hover another window over it. the drop shadow from the foreground window will still cast a line.
it's hard to explain.... here is a picture of our finder window with another window on top of it.
noticed the blue and white around the drop shadow area? all of our windows don't have the blue/white anymore.... what could it be?

that worked, thank goodness, thanks! not sure why I didn't try that

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Last edited by zacariaz (2013-08-19 15:15:12)

Just a small update.
I think I did it mostly right on the last try, however, I couldn't boot:
Attempting to register /dev/sda with bcache
ash: write error: Invalid argument
Attempting to register /dev/sdb with bcache
ash: write error: Invalid argument
Attempting to register /dev/sdb1 with bcache
ash: write error: Invalid argument
Attempting to register /dev/sdb2 with bcache
ash: write error: Invalid argument
Waiting 10 seconds for device /dev/bcache0 ...
ERROR: device '/dev/bcache0' not found. Skipping fsck
ERROR: Unable to find root device '/dev/bcache0'.
The only thing that comes to mind it that I made two boot entries with gummiboot, as I wasn't sure if I should define sdb2 or bcache0 as the root partition, but if that was the issue, I should at least get a boot menu I would think.
So that's how it is right now. I haven't got a clue what might be wrong.
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IMac 2010 Graphic issue? Can't Figure Out

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