MacBook Pro boots to grey screen

I have a non-booting MacBook Pro that will POST (Apple chime) and boot to a grey screen.
I consider myself a pretty advanced troubleshooter but this one stumps me. Here is a summary of most of what I have tried so far, not necessarily in this order:
Reset NVRAM
Reset PMU
Attempted to boot to DVD Command + C
Attempted to boot to Target-mode Command + T
Attempted to selected startup disc manually Command + Option
Attempted to boot to SUM Command + S
Attempted to re-image firmware using CD
Attempted to boot diagnostic CD Command + D
NONE of these work. I have fixed many Macs in my day and have not encountered an issue like this!

I've been through both a logic board failure and a hard drive failure on my iBook, and neither had these symptoms. Since the article I referred to had to do with having no video, my guess would be that it is the logic board but I don't really know. It doesn't really sound like hard drive failure to me, or at least it's nothing like the way mine failed.
Since the article wants you to reset the PMU in an older Mac, and I suppose the SMC in a newer Mac, I wonder if actually it is the SMC which has gone bad. The SMC is an integrated circuit after all, and if it were to go bad and not be able to be reset, then that might explain what's going on here.
But I'm just speculating. It will be interesting to see what Apple has to say. Please let us know.
Good luck!

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    Message was edited by: lolaroseuk

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    House3917 wrote:
    I started the Macbook with the OSX Leopard install CD...
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    steambeam wrote:
    Hey.
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