I have a Dual Core 2GHz, 2 Gig Ram MacMini running OS 10.4.1 I can turn my computer in the morning and bring up the desktop but after a short time..1 -3 minutes the Reset/Power Off screen appears in several languages surrounded by a darkened screen and my keyboard and mouse are locked up. the only option is to hold the power button down to reset, and the screen appears faster the second time. I have run diskwarrior and was lucky to get thru it and the fix lasted only a couple of hours. I have tried the Leopard install disk but couldn't even get to utilities to see if I could run them. The reset screen appeared but only the top 1/2 of it, the rest was black with the desktop behind it. The machine is unusable. Can anyone suggest anything? On Apple Forum someone with a similar problem took his in for repairs and they didn't find anything wrong... I am under warranty and do that, but I live in Costa Rica and it is difficult to do.