Mac Pro 2006 won't display anything

Hi
My mac pro won't display anything. I've had a look at this http://support.apple.com/kb/HT1573 and one of the first things I did was reset the PRAM & NVRAM. The 10.6.8 install is fully updated. The startup chime plays and fans run normally.
I have:
re-sat the RAM,
cleaned the RAM
cleaned the inside
removed all the HDDs except the main one
and even used another Raedon 4850 in place of mine.
It starts up in Target-Disk mode fine, I am using it with my iMac now but it is not the same (iMac is only dual core andhas half the RAM) I've tried several screens; DVI, VGA and HDMI all without luck. It's obviouslt out of warranty and I don't want to take it to a Apple store anyway as I ocassionally build & repair computers myself so am fine with trying anything out.
Thanks in advance,
Eric.
Things I could do/ haven't done:
Remove/ replace the Logic Board battery?
test the power I/O?
start in Safe Mode?

Whoa there, sparky !!!
Is there something you aren't mentioning?
Since there has never been a Mac Pro 4850 and you have mentioned this number twice I would like to ask...what aren't you telling us?
Did this computer work fine until one day it quit? Or did you buy/inherit/find it broken or in an unknown state?
Any GPU used in a Mac Pro needs to have EFI on it to do this basic debugging stuff. While PC WIndows BIOS cards can be used if the system is A-OK and gets to desktop, it is basically impossible to use them on a system with issues.
So, if the 4870 has a DVI and a MDP port it is real Apple one and SHOULD work.
If that card died and you have tried replacing it with a WIndows/PC 4850, then you have broken the scientific rule about only changing one thing.
Ideally you would have another Mac Pro to test your GPU in and another KNOWN GOOD GPU to test in your Mac Pro. The EFI thing greatly complicates things, unfortunately. Even a "Mac Pro" video card won't necessarily work if it is for "the other" series of Mac Pro. Ther have been in effect, 2 different Mac Pros as far as video cards go. EFI32 and EFI64. ATI/AMD cards have been largely unaffected by this but Nvidia cards MUST be for right series.

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