IMac Freezing Up/Blue Screen

If this was posted in the wrong forum, please move.
Sunday evening, my iMac G5 started freezing up a lot. I was forced to keep restarting my computer. Originally, I thought it was due to Firefox 3 seeing how I just downloaded it a few days prior. I ended up deleting Firefox, but the problem only got worse. After looking online and trying such things as repairing the permissions, I gave in and did a disk install (while keeping network settings and files). Disc 1 install went fine, but everytime I tried to install the contents of disc 2, it would freeze. I decided to just attempt to do a full re-install losing all of my contents of my computer. Finally, while starting in Safe Mode, I was able to finish installing disk 2.
However, now I can't even get on my computer without it going to a plain blue screen (NOT the default wallpaper) and either the spinning pinwheel (I assume it was freezing up) or a curser. There wasn't any dock or any icons most of the time. Occasionally, it does take me to my default wallpaper, but it freezes up before the entire dock shows up.
Everything seems to work fine in Safe Mode, but trying to log into the normal mode always gets me to the blue screen or a frozen screen.
My S.M.A.R.T. said that it was verified. Meanwhile, through the install disk I have been in Disk Utility and I have ran a disk repair and repair permissions. The problems continues though.
I've presented my problem to another message board which had the general thought that my HD was dying and I was in need of a new one. However, I have conflicting reports as another person is saying that my HD is not dying, especially considering the S.M.A.R.T. was verified.
Right now money is tight, so I can't just easily go out and buy a new HD. So I'd like to try anything before giving into that. Any help would be greatly appreciated.
Details:
17-inch iMac G5 (Ambient Light Sensor)
1.8 GHz PowerPC G5 processor with a 17-inch screen
Owned since Sept 2005

Hello and Welcome to Apple Discussions ...
If you haven't tried this yet... grab your system restore disk(s). Make sure your Mac is shut down. Now, while holding down the C key, press the power button and insert the disk. Keep holding the C key until you see the Apple logo on the screen. Now, an Installer window will open... ignore that and go up to the Menu and click Utilities/Disk Utility. DU will launch. Select MacintoshHD in the panel on the left, make sure the First Aid button is selected and click Verify Disk. I'm not talking about the S.M.A.R.T status.. this is going to check to see if there are errors on the drive. If DU reports errors, click Repair.
Now, you can't use Disk Utility from the Application folder on the drive, you can only Verify and Repair the disk from Disk Utility on your restore disk(s). If Disk Utility reports errors but cannot repair them then you might want to look into a good disk repair utility such as DiskWarrior
www.alsoft.com or TechToolPro www.micromat.com Neither are expensive.
I understand how important your Mac is to you and I hope this helps.
Carolyn

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