Windows 8.1 bootcamp setup, now when rebooting I am getting permanent Grey Screen

I have Yosemite installed on MacBook Pro 2013, created bootcamp with 8.1 and installed with no issue.
Been using Windows 8.1 successfully for over a week. Needed some files from my OSX so used the bootcamp option in the taskbar to reboot to OSX and copied the necessary files to a ext hdd.
Now when I set reboot to WinOS (Bootcamp) I am stuck in permanent grey screen. What I can do to try to figure out what is wrong, as the partition is NTFS, Disk Utility does not work.
I can boot back to OSX with no issue, can't seem to get back to the WinOS.
I don't want to start all over again, took me 3 days to get all the software and configurations installed successfully...
Actually this may be another problem, originally I installed Win 7, once installed I upgraded to Win8.1, could this be an issue? It has been running successfully for 5 plus days??

Nevermind, I left it sitting there for 3 hours and it finally logged in? backed up the system and reboot and it came right back up???? So it is resolved.

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Message was edited by: CMK1

Hi guys. I've had my MacBook Pro for 2 years now. Last night it suddenly kept glitching to a dark grey screen every now and then, then it would flash yellow / blue spots, and now it won't go past the grey screen even when I reboot it. I don't think I can

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I've had my MacBook Pro for 2 years now. Last night it suddenly kept glitching to a dark grey screen every now and then, then it would flash yellow / blue spots, and now it won't go past the grey screen even when I reboot it.
I don't think I can access my disk anymore as I've moved across countries since I've first gotten my laptop. it was working perfectly fine before it kept going to the dark grey screen with a little blue on the bottom.
If it helps, my camera light is still on, and it seems that my computer is working properly itself, but won't go past this grey screen.
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 DALE

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Windows 8.1 bootcamp setup, now when rebooting I am getting permanent Grey Screen

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