MacBook Pro :: Screen Goes Black And Orange?

I'm having some problems with my Macbook Pro. It's two years old - purchased in the spring of 2012, it's a late 2011 model.  

It's been running fine up until a few weeks ago. First, sometimes, after you close it and open it again, the keyboard lights up but the screen stays black, and you have to restart it. This has usually happened if you open it too quickly after closing it again, but the last time it happened after the laptop's been closed for over an hour.  

Then, today, while I was using the laptop (not at start-up - it has been running for some time), the screen went orange. I had to shut it down, and it took four or five tries to get it to start again - the first few times, it turned on but the screen stayed black, then the next time it turned on, and kept playing the Mac start-up musical sound over and over again until it turned on, and then it finally turned on and started up.