My Aluminum iMac wont go to the login screen, just shows the Grey screen.

I have had my iMac for a little longer than a year, and the warranty expired last month. When i turn it on, i get the grey screen with the apple logo and the spinning gear, it wont go to the login screen. I have restarted it a few times, but nothing is working. A few weeks ago I had a similar problem where i could only log into my guest account and not the main account on the computer, i restored my system from time machine and it has worked fine until today. The hard drive has been making weird noises for quite some time now, but i havn't had other problems besides that. What should I do?

I have done this many times, and it says that everything is fine. There is probably some hard drive problem from what i have heard, but i just restored the system from time machine again and everything is working...when I did this last time, within a week or two, it went back to the problem I had in my original question. I am thinking of reformatting the hard drive, and putting all of the files and programs that I need onto the external drive, so I can have a fresh start. Do you know if this might solve the problem? Are there any other options? Thanks

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