Start up goes to normal blue screen and hangs

I shut down my macbook last night and this morning i triewd to turn it on. It went through the normal screen with the apple and progress circle. then it went to blue and then back and forthe from gray to blue. I have force shut down, reset the smu, removed the battery and used just the power adapter, tried just the battery. Please help!

Sorry to inform you that you are on the iMac G5 forum, you need to head over to the [MacBook|http://discussions.apple.com/forum.jspa?forumID=1167] forum.

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