It's been stuck like this for a while.
It looks a bit reddish. My 2011 15" MBP was like this also. Is your's a 2011? If so, it might be Radeongate. If you keep trying to restart it, it might come back to life, but this will likely keep happening.It's been stuck like this for a while.
I would try running Apple Hardware Test (if you have pre-June 2013 mac) or Apple Diagnostics (if you have a post-June 2013 mac).
Well I got it to come on and it comes every time I restart it. Now there's a damn loading bar every time it restarts. I'll run it for a few more days and if I get the pinkish screen again I guess I'll have to go beg Apple for a depot repair. I ran out and bought a terabyte external drive to back it up in case things get worse and I'm without it for a week or more.
The "damn loading bar" is normal. This is how it looks in Yosemite.
The logic board failed. The good news is Apple waived the depot repair fee even though it was out of warranty. I'm thankful for that.
Early 2011, 15"
So the replacement logic boards are failing too? I was hoping they couldn't fix mine and had to replace it.
I got it back from Apple. Everything is working fine so far. I just hope that if the replacement logic board fails it does so within 90 days.