MacBook froze and won't turn on again

About an hour ago my MacBook all of the sudden froze, which it has never (14 months old) done before, and I can't do anything to get it started again. I had watched a DVD before and was working on Word after that. I noticed that the Mac twice had trouble saving a document and seemed to be about to freeze, but didn't. The third time it did so. Now, once I push the Start button, the screens turns grey, and a repeating clicking sound from somewhere around the DVD-Drive can be heard, which continues until I hit the start button again and turn the Mac off. If I don't do so, so ventilation sets in after roughly two minutes. Nothing else happens. I have tried all key combinations for all different kinds of resets suggested by Mac-support, all of which seem to work (according to sounds the Mac is supposed to make and does make), but did not change anything. I also took out the battery, no result. Thanks very much for any kind of suggestion

Hi kevven, and a warm welcome to the forums!
Just to expand a bit on Sig's great advice...
"Try Disk Utility
1. Insert the Mac OS X Install disc that came with your computer, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
5. Select your Mac OS X volume.
6. Click Repair. Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
The usual reason why updates fail or mess things up, is if Permissions are not fixed before & after every update, with a reboot... you may get a partial update when the installer finds it doesn't have Permissions to change one obscure little part of the OS, leaving you with a mix of OS versions.
Some people get away without Repairing Permissions for years, some for only days.
If Permissions are wrong before applying an update, you could get mixed OS versions, if Directory is the slightest messed up, who knows!
If many Permission are repaired, or any Directory errors are found, you may need to re-apply some the latest/biggest updates.
May even need to do an Archive and Install if you have room on the HD, but saves all your files and gives a new OS...
http://docs.info.apple.com/article.html?artnum=107120
I only use Software Update to see what is needed, then get them for real via...
http://www.apple.com/support/downloads/
That way I can wait a week or so, check the forums for potential problems, and get Permissions & such in order before installing.

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