Originally posted by: evolucion8
If it was related to the graphic card itself, it would have issues also in Windows:
"Apple may already be aware of the issue. Some of those calling the company's support line have heard from technicians that there are numerous reports and that a fix is in the works, possibly arriving along with the looming Mac OS X 10.5.7 update. Some are being offered replacement systems after unsuccessful troubleshooting"
But when is hardware related, it gives issues regardless of the OS like with the 9400, 9600 and the 8600 series of cards which breaks in Windows and Macs. So definitively is a software issue or the Power Supply isn't enough for that card.