Trying really hard to fathom this little gem out.
Had a 8800GTS running fine but it broke so I returned it and bought a 8800GT instead. I used an 8400GS while the RMA was dealt with. All worked fine.
Now my 8800gt has arrived, but when installed the Motherboard instantly gives a 9.0. error, re-boots a couple of times then changes to 9.8 then 9.9. There is a black screen throughout and it says no signal.
If I put the 8400GS back in all is well.
Tried all sorts, connections seem fine. I read it needs 24amp on the 12V rail so I used the supplied connector over both my rails (18amp) each but no joy. I have a Seasonic S12 600W power supply.