I have a Mac Pro 1.1 and I've been successfully running a flashed XFX ATi 4870 card for a month or so. Yesterday evening I left my computer in sleep mode, when I came back it appeared to be awake with only one of the two screens working and everything frozen. Both screens were connected to an Apple ATi 2600 XT and nothing was connected to the 4870. I held down the power button and restarted, the fans on the graphics cards ramp up and then down as usual and the computer makes the startup dong noise. I can hear the hard drives and optical drives working as usual then the drives appear to shutdown and I'm left with the computer apparently doing nothing. - Fans are running - Screens are in standby (LED's on) - Both screens are connected to the ATi 2600 - 2 x 20in Apple Cinema Displays - Nothing is connected to the ATi 4870 - No LEDs are lit up inside the case Once I remove the ATi 4870 the computer starts up normally, putting the 4870 back in give the same startup problem. Is there anything I can do to get the 4870 working again?