Can't start MacBook Air––wheel turns around forever

I had my MacBook Air A Rev C 1.86GHz 120 GB powered on and on sleep for about a week. I was using my other MacBook Air and so left this MBA on sleep.
I decided to use the older MacBook Rev C Air again and I tried connecting the ethernet cable to it. The internet connection didn't work, so I restarted the computer thinking it might help.
However, the computer DOES kind of start and I get the apple logo and the light gray background but the wheel goes on forever, for 30 minutes.
When I tried Option-Start, I was able to get into the Windows partition fine, but when I tried Option-Start and selected Mac, I have the same problem––the gray screen and the wheel thing under the Apple logo going around for a while.
I never had any major problems with the computer in the past, and I never had this problem of starting the computer. It was a bit sluggish––would take 3 minutes to start up, but never as long as this. I have tried rebooting several times and it still does not work.
I should tell you that I pressed the "Shut Down" button for five seconds to shut down the computer.
Do you think that caused it?
How can I get the Mac OS back?
Once again, getting into Windows Bootcamp is fine, it's just the Mac part I can't access.
I have the hard drive saved on a backup.
Should I try reinstalling the OS? And do a clean install? And then put all the information back onto the computer using the backup drive?
Just checking here before I try that because that solution takes time.

I went into Bootcamp (Windows XP Prof) and looked at the Macintosh HD drive. I got 97.8 GB total size and then 425 MB free space.
Something happened when I connected the ethernet cord to the USB port and then connected the router. It mucked up my computer and swallowed up GB. I had about 10 GB spare before this happened.
That is probably why the computer can't start up and is stuck at the gray screen with the whirly thing going around forever––there is no disk space for it use its start programs.
I don't know how to clear the unwanted Gigabytes because I can only see Mac HD from Bootcamp.
Any suggestions?

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