I think the GPU just went. Bah. 
15" late 2011 2.2GHz ordered on launch day. No AppleCare.
Scrambled display for a half second when scrolling down a webpage in Safari then the screen went black. Powered the Mac off and back on, it chimes and there are green lines across the display. Fans start screaming, sticks at a grey screen and it powers off after about a minute. So that's 99% certain a bad AMD graphics chip then. On the upside target disk mode is working.
I'll be booking a Genius appointment and taking it in this week I hope...

15" late 2011 2.2GHz ordered on launch day. No AppleCare.
Scrambled display for a half second when scrolling down a webpage in Safari then the screen went black. Powered the Mac off and back on, it chimes and there are green lines across the display. Fans start screaming, sticks at a grey screen and it powers off after about a minute. So that's 99% certain a bad AMD graphics chip then. On the upside target disk mode is working.
I'll be booking a Genius appointment and taking it in this week I hope...