MacBook Pro won't boot in any mode

My MacBook Pro was working all fine and dandy until I left it for a week whilst on holiday and when I came back it wouldn't boot. It just sits on a blank grey screen after the apple logo and spinny loading circle. After some research I saw posts about starting the mac up in different modes. Safety mode- sits on a black screen, Recovery mode- sits on a grey screen. After no luck I saw about single user mode. Booted to that and used the fsck command and my hard drive was working fine which brings up the question could it be the logic board. I hope not as I only got this replacement around last December and my apple care has now run out.
Anyone have any ideas or have come across this before. Also I need to backup my files as I can't really afford to lose them, I have a external hd.
Thanks

Hi dbralph,
It sounds like you have been on the right track in troubleshooting this issue. If it is still booting to a grey screen, you may find the troubleshooting steps outlined in the following article helpful (apologies if you have already seen it):
Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/ts2570
Also, if you need to access your files and have access to another computer, you may be able to start your MacBook Pro up in Target Disk Mode to access the hard drive:
OS X Mavericks: Transfer files between two computers using target disk mode
http://support.apple.com/kb/PH13842
Regards,
- Brenden

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