Unable to boot from anything

Hi,
I upgraded my Mac Pro (2.26khz) from a retail install cd 10.5.4. Did an archive and install and everything worked fine. I rebooted the computer and it got stuck on the Apple logo...no spinning cog.
I then tried...
Holding Option to select a disk...
Safe mode
PRAM reset
SMC reset
Booting from the install CD
Target Disk Mode
Nothing works and now I just get a grey/white screen and no Apple logo.
Is this now definitely hardware? Should I try removing RAM to test further?
Help much appreciated..

2.26's never existed until 2009 model year and those need OEM, not retail, 10.5.7.
2008 came with 2.8GHz (khz)?
2006-7 came with 2.66GHz

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