Hi all, So about a month ago I got my 2011 iMac back from repair where they apparently replaced the logic board, graphics card and LCD (which thankfully I didn't have to pay for!) due to it completely locking up and refusing to boot (details here). Everything has been fine for a month until a couple of days ago. The screen randomly started "glitching" with lines going across it, then it would appear offset (wrapping half way around the screen) or with scan lines going through it then it would go into a "seizure mode" (my friends name for it not mine!) where it would flash brightly between bight white and grey before crashing to a black screen. The issue originally appeared in windows 7 so I booted into OSX which seemed fine and stable for a couple of days until last night when a similar thing happened. I left it switched off for the night and returned this morning to find that it won't boot into any OS at all and I have pink lines going vertically down the screen for the start of the boot process until it locks up entirely, see the photos below: Is my graphics card hosed?