Start UP problems, blue screen, Imac (intel) 1.83 17"

I posted this Saturday in a different area. So forgive me if I did this incorrectly.
Imac DuoCore 1.83 (originall with 10.4 Tiger)
Upgraded to Leopard several months ago without problems.
Have the lastest updates.
Two days ago the following started:
1. Starts up-no chime
2. Apple logo is seen (grey)
3. light blue screen with progress wheel-not the pinwheel)
4. screen dims a bit, progress wheel dissappears then comes back and it does
the same thing.
I ran the Disk First Aide from the CD, performed verify and repair disc.
Came back with repaired completed. Everything seemed ok.
Restarted...but the problem persisted.
Next I reset the PRAM...
Chime came back on start up.
Ran the CD a few again. Said it was all ok.
Restarted....and back to blue
I ran hardware test from the original CD
all came back fine. Two items were repaired.
Restarted and back to the blue screen.
Tried Single user interface and ran /sbin/fsck -fy
Again 2 items were found and repaired.
Restarted.
Hardware and software seems to be fine acccording to this.
SO it seems it's the PRAM battery. I think. ANy other ideaS???
ALSO...this machine is out of warranty. Not afraid of cracking it open.
But, where is the praam batter located? Like to know what the part number is to have it on hand when I open it.
Any help appreciated.
RLM

I opened up my iMac and replaced the PRAM battery. No change.
I then took out the Hard drive and placed it in my G5 destop.
When i restarted it I could see the hardrive and it's contents. Both HD have
10.5.7 installed so I thought I could restart with the Imac HD
and then back it up. But it wouldn't start up and jumped to the
G5's HD. My question is:
1. Is the reason it would not recognize the iMac HD as a start up disk because
it's from a duo core intel mac?
2.Is it because the iMacs HD has some problems in booting up?
(as I wrote before I have run every test available with positive results
yet continue getting the blue screen)
And since I can read and see the imac drive in my G5, how can I back it up short of dragging everything to a new drive since I can't log into the individual users. Of primary importance are the pictures in iphoto in different user accounts.
Thanks for any help
Richard
Message was edited by: Richard Mora

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