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Mac Pro 1,1 new PSU no chime or post

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    Mac Pro 1,1 new PSU no chime or post

    Hey folks,
    Tower died right after purchasing new CPUs and RAM (before I could even install). It's been 64bit enabled with SFOTT/Tiamo, and had teh firmware flashed to 2,1, but no new hardware installed yet. I could hear something powering on in the PSU but then it would quickly power back off, with no life shown anywhere else. So I got a 1,1 PSU off eBay and installed it. The thing now powers on, but never chimes or boots or sends any signal to the monitor.

    Here's what I can confirm it does:
    The fans spin at a low, normal, rate (unlike some that are experiencing problems and the fans are running maxed). The red lights on the RAM boards light up as they used to. I can hear the HDD engage and spool up. The white LED indicator light on the power button comes on as normal.

    What I've tried:
    Reseating RAM (the original 4GB, but maybe not in the original order?), reseating the RAM boards, reseating each of the 3 7300 GTs in the PCIe slots. I've also tried unplugging and pressing the SMC button by the top PCIe slot. Should I be doing this while it is on, or off, and for how long do I press it, etc.

    Any advice here would be great. I'd love to get this thing running again or return the hardware I've bought. before the return period is up.

    Cheers
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