MacBook Pro 2011 stuck on grey screen after loading

Hi guys. I've already checked many threads in many forums, but I can't succeed in this problem.
I have a Macbook Pro8,2 (2011) that doesn't go beyond the boot screen, regardless of which disc you boot it from (tested with 4 different bootable partitions). Apple logo with spinning wheel, then grey screen with fast spinning fans. I tried everything: safe mode, netboot, single user mode, accessing recovery, resetting SMC and PRAM, Apple Hardware Test (it states it's all ok). I even took off the ram sticks singularly and unplugged the internal hard drive to realise if the SATA cable is faulty. Nothing has worked so far.
Any other suggestions before I call Apple Supoprt and pay hundreds of euros for a new logic board?

ultraago,
You may have the problem that I, and scores of others, have had with the faulty GPU found in a number of 2011 models, as discussed here -> https://discussions.apple.com/thread/4766577?tstart=0.
Usually the problem begins with graphics glitches and then it's downhill from there. The AHT will not report any problems and neither will the tests that the Apple techs have available.
If you do have this problem, then having the GPU reballed is the least expensive, and longer lasting, 'fix.' Apple will want to replace your logic board - don't fall for that scheme (unless you're still under warranty). I had my logic board replaced because I have AppleCare until next year. But once my AppleCare runs out and the problems come back again, I'm going the reball route.
Good luck,
Clinton

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