Mac won't start up; shuts down after grey apple start up screen :(

Well I have just recently came off a two week holiday from Mexico, and straight away I log onto my iMac, as usuall I try to update it as often as I can so I am upto date.
Well I did that, and I found that I had loads to update because I had been away. Soo as normall I allowed it to update. I left my iMac to its own devices for about 2 and 1/2 hours, so it can update, whilst I was on the PS3. Once I had finished on the PS3 I had came to find, that when the iMac automatically starts up to install/update software, that it had frozen.
So I left it for another hour, to see if it could sort itself out, but just my luck nothing happened.
So I held down the power button, until I forced shut down my iMac. When I came to start my iMac back up again, it chimed like usual, and went onto the grey startup screen like usuall, then it took ages to respond, the wheel thingy, just kept spinning and eventually it stop and my iMac shut down.
And it keeps on shutting down like that and won't boot up, but some how it has gone into Safe Boot Mode.
What shall I do, a go from here on, to get my iMac back to normal?
Many thanks to any posts in advance.

Think I have sorted it guys with a bit of searching:
Solution:
Reset System Mangement Controller (SMC)
http://support.apple.com/kb/HT1543

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Mac won't start up; shuts down after grey apple start up screen :(

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