I bought my APMBPMD311LL 17" MacBook Pro Notebook Computer on 03/10/2012 ($2,500) and it was perfect until a few weeks back when I started getting the graphic distortions seen on the OP in this thread, then this past week it became more frequent and yesterday it got that bad that it will no longer boot.
Based on the reports in this thread I'm not expecting Apple to assist with this seeing that it is out of warranty, even though I believe that this is a wide spread latent defect.
What I have read is it stems from the move to lead free solder, which over time and thermal cycling becomes brittle, which lead content solder does not.
Made an on-line appointment to see my local Apple store and surprisingly they booted it from their network and performed hardware test, which it passed.
They checked their data base for known issues with this model and it came back with nothing.
We then tried a boot from the HDD and it hung on the grey screen.
They had two options, 1) they install a new Logic Board at their store for around $550 or 2) send it to a local repair place for a flat rate of $310 regardless of what part needs replacing with a turn-around of 3 ~ 5 days.
I took option 2.
If I get a working reliable machine for $310 I'm good with that.
What's the life expectancy with a repair done by Apple at the off site repair facility?