Windows 7 partition works fine, Mac OS X faces grey screen of death

Hi all,
I have a very weird problem and I hope you can help me out.
I loaded Win 7 on a seperate partition. Up until recently, I could load into either Win 7 of Snow Leopard without any hassles.
Recently, whenever I try to boot into Mac OS X , i get the grey screen of death....and i can't figure out a reason why. The weird part is Win 7 works perfectly fine....no issues whatsoever.
Any ideas about what could have gone wrong? Thanks a lot!!

Boot from another Mac OS media - hard drive or DVD - and use First Aid Disk Repair.
Did OS X crash/freeze or something?

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Windows 7 partition works fine, Mac OS X faces grey screen of death

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