Stuck at gray progress indicator screen for 1 min - then fan speed races...

Hello,
I have read through a bunch of posts here and figured I would give my scenario. I have a 1st gen iMac G5 - My fiancee used it in college and then I boxed it up and it sat in the box for about a year or so untouched. We just moved into a new apartment so I figured I would hook it up. I plugged it in and it started up a bit slow - but I was able to log in ok the first time - then I did a software update (i figured it could use an update after sitting for a year)
Then I restarted and it would not make it to the login screen.
I power up, it goes to the grey apple logo splash screen for about 1 minute, then the fan starts racing on high and there it sits... forever racing and progress indicator spinning. I have tried the SMU reset (via unplugging the power cable and reconnecting and holding power button)
PRAM reset by holding command+option P+R.
Is it possible my PRAM battery is shot from sitting in the box for a year?
It is also a probable software issue from updating??
I tried booting in safe mode but did not work, actually I belive the computer just turned off after 1 minute when I did try to boot into safe mode.
Where can I go from here, given the information?
Thanks much.

Welcome to Discussions - it is likely that your PRAM battery (CR2032 3v lithium) will need replacement and it would also be a good idea to boot from your install disc and run Disk Utility:
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.
You could also run the Apple Hardware test from your install disc.
Make sure that the air vents of the computer re not clogged, you can vacuum them.
Please post back and let us know how you made out,

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