Judging by the internet, and lets face it what could be more sensible, much of what Apple does is just wonderful. Generally I concur, however sometimes something goes wrong. One thing that has gone wrong seems to have been the 2011 model 15 and 17in MacBook Pros. More specifically the graphics cards. Take any of these macs, add heat (i.e. use the thing) and pretty soon it will stop working. Which is nice.
Since way back then, Apple have been pretty blasé about this but thankfully they do seem to have changed their minds rather suddenly. Announcing the (finally) Extended repair programme for 15 and 17 in MacBook Pro's made between 2011 and 2013 with AMD graphics cards. I'm guessing that's a LOT of MacBook Pro's. I certainly have four here at the moment, all dead or dying. It's like the Somme I tell you.
So, if you have one of these machines, (the quickest way to tell is probably to turn it on, if it starts and works then you don't), from the 27th of February you can take it to Apple. They'll take a look and repair it for you for free. Until 2016.
Here's a page with more info from over at Jeff Gamet's MacObserver website: