Hey guys, I just got myself a 4890 and I have run into some problems during installation/flashing.
The card is a 1GB XFX Extreme Edition 4890 card, model HD-489A-ZDEC.
I initially had an ATI X1900XT installed in my Mac Pro (model 1,1 btw), so, after backing up my original ROM, I put the X1900XT back into my machine and installed Natit using Cindori's ATI Flashing Tool (selecting the XFX card version for Natit instalation).
Next, I took the X1900XT out and put the 4890 back in to flash it. Unfortunately though, I was getting a black screen on startup. So, I went about flashing the card via Screen Sharing on my notebook. Using Cindori's ATI Flashing Tool and the ROMs provided, I flashed the card using the XFX "Overclocked" ROM (because I have the overclocked card). I then also removed Natit and installed QE.
So, with this done, I restarted my Mac Pro, which came up with the grey boot screen. Unfortunately though, the screen then turned all grey and froze. I tried restarting again and this time, it got past the grey load screen and froze on a blue screen. I have tried restarting several times since then and while I sometimes arrive at my logon screen, there are always screen artifacts/staircase glitches. Furthermore, I sometimes get the famous "Check your video card's power cables!" warning message, although I don't think they are the issue here.
So, I have attached my card's original ROM. Any help here would be greatly appreciated as I don't really know where to go from here.
Thanks to everyone here in advance!