PowerPC G5 iMac only booting up in Safe-mode - Help!

In July of 2005, I purchased my PowerPC G5 20" iMac, 2.0GHz, +260 GB harddrive and 2 GB of DDR SDRAM. It has been running so great that I even upgraded to Leopard OS 10.5.6 in June of 2011.
However in Nov. 2011, the computer would freeze upon start-up, and I would have to hold the power button to shut it down. After waiting a minute I would start it up and the OS came up ok. But each week I had to shut it down and restart a few times before it booted up ok. I ran the OS Disk Utility to repair permissions and it did not seem to make a difference. I also ran MacTuneUp 3.6.0 (purchased it in 2010), and there was also no difference.
Now I can ONLY boot into Safe-mode - Help!!!

Discovered something new!
I left my iPhone connected to the iMac, and when starting up the computer the iPhone started charging. When the screen froze (light blue shade, not black screen), the iPhone stopped charging. (no charge?).
BTW....my mouse always moves when in frozen state.
I also tried starting up (c-key) using OS 10.5.6 CD and computer also froze in light-blue screen. The computer tried to access the CD but then gave up. After leaving the computer for awhile the screen power saving mode was on (screen was black). When I moved the mouse the screen changed from black to light-blue screen. Boot CD did not work. No keyboard commands work. Only holding the power button will shut down the computer.
Help!!

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