Lion won't restart, but Windows 7 runs fine

I recently installed Windows 7 on my macbook pro with bootcamp, and so far it has been working great. As of right now though, i can't boot in to the mac side, only windows. When I try to boot into the mac side it stops at the startup screen with the apple logo and it has the circle of rotating lines under it. It stays there and doesn't go any further. I'm not sure what to do, and need to know a solution asap.
Thanks for the help.

Try a safe boot, hold the shift key as soon as you hear the chime (not before), keep it depressed until you see the Apple Logo and the spinning gear. Post back.

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Hi jill not jillian (glad that is cleared up) and welcome to Apple Discussions!
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