Something really wrong with my Mac

The main problem is that when I turn it on it shows the apple logo and the little loading wheel under it but after letting it run for about four hours it hadn't started. To try and fix the problem I put in the Mac OS X disc and erased the operating system and re-installed it. Once I did that it ran fine again for about a week then the Mac froze and I turned it off and was stuck with the original problem again. I've repeated this process several times and keep getting the same problem. Is there any way I can get my Mac to run correctly again?

There could be several things awry, first off, did you repair permissions after reinstalling? You can use Disk Utility to check your system:
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.
After you have repaired the disk, use Disk Utility on your hard drive to repair permissions.
You might also want to Rum Apple Hardware Test from an install disc, boot it holding down the D key, to make sure that there is nothing wrong there.
If you don't have the iSight, open the back of the machine and check your [LEDs|http://support.apple.com/kb/HT2831].
Do let us know how you make out,

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