Now that I have your attention I have a MacPro1, 1 here (Dual-Core 3GHz x2 w/2GB) giving us fits. It first started with the dual Nvidia 7300GT acting up. We think we have the culprit card removed but Im still seeing some minor display anomalies here and there. With the suspsect card, at start-up the system will not follow thru and basically requires a hard-boot to actually get the log-on screen. This was fixed by removing the suspect card. Now the new problem is that when the mac goes to sleep, the system freezes up and has to be hard-booted to get it going again. Sure we can just shut that problem off but now Im thinking it might not be the video cards after all.