On Apr 2, 2010, at 2:15 PM, Noah wrote:
I bought an ATI Radeon 7500 and popped it in.
This is an Apple OEM Radeon 7500? The Apple OEM Radeon 7500 was kinda rare, it only came in the 2002 Quicksilver G4. AFAIK there is only one Mac firmware for the 7500, it was the original version 222. You could check this in System Profiler>Graphics/Displays>ROM Revision.
If it's a flashed PC Radeon 7500, there could be some issues, but normally these would manifest as graphics glitches (lines or regular patterns) rather than a black screen. Are you certain the backlight in your LCD isn't going bad?
Reseating the card might be a good idea. Whatever the problem is, it's not common to Radeon graphics cards, and seems more like a connection issue or a monitor issue to me.
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