Starp up problems -Imac Duo Core

Imac DuoCore 1.83
Upgraded to Leopard several months ago without problems.
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 frim the CD, performed verify and repair disc.
Came back with repaired completed.
Restarted...but the problem persists.
Ran the CD a few times with the same result.
Any ideas???
Thanks in Advance
RL Mora
PS
There is nothing else attached and or installed hardware wise

Try running the hardware diagnostics:
How to run hardware diagnostics for an Intel Mac
Boot from your original OS X Installer Disc One that came with your computer. After the chime press and hold down the "D" key until the diagnostic screen appears. Run the extended tests for a minimum of two or three hours. If any error messages appear note them down as you will need to report them to the service tech when you take the computer in for repair.
Some "common" error indicators:
SNS - sensor error
MEM - memory error
HDD - hard disk drive error
MOT - fan error

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