So I had a problem with my 6870 powercolor which meant that it defaulted to no display adaptor whenever I started Windows. I had reinstalled the drivers, the DVI cable was fine (worked through the motherboard) and the power supply is sufficient to run it, spec is as my sig. I even plugged in my old 4850 into the motherboard and it worked first time. I RMA'd it to Ebuyer and they have just told me they are returning it with no fault found. I am sure when I receive it back the same problem will be occuring so am asking for any further suggestions as to what might be wrong with it??