Dead G5?? No chime, no video, nothing

Hi guys - I've got a G5 emergency! I put the machine to sleep this morning, and when I got home, it was making the "wind tunnel" fan noise. I shut it down, and now when I try to power it back on, this is what happens:
The power light illuminates, the drives spin up, the fans power on, but that's all - no chime, no display, and after a couple minutes - "wind tunnel"
Is there any hope? Are the processors dead? Is it even worth trying to repair? Is there anything at all I can try?

Sadly, the machine doesn't seem to recognize the keyboard or really any input/peripherals/anything.
So I tried the PMU reset a few times, as well as the other suggestions in the kb docs. I attempted to reset the pram, but since the machine isn't accepting input, it didn't work, nor did booting from cd (which wasn't possible anyway since the eject key didn't work)
I ended up bringing it in for service just in case it's something simple. While there I also bought a MacPro because I've got a bad feeling something important is fried. If it ends up being a simple repair, I can always use a spare machine

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