I bought a Dual-Core 2GHz Power Mac last month and just got around to opening the box and setting it up about a week ago. Other than a distinctly annoying sound coming from the right power supply fan in the bottom of the case I notice two issues that may require part replacement. First, every time I power on the PM or it 'wakes from sleep' (more on this later) a small red LED light located on the logic board just behind the power button blinks on for about a second and then turns off (as the system and fans start up). Second, this Mac does NOT sleep! 10.4.2 was installed from the factory w/ the bundled software. I couldn't get this thing to sleep even after reformatting and installing 10.4.1 (from another Tiger DVD), and updating to 10.4.2 again and then to 10.4.3. Basically I'll put it to sleep...it'll actually 'sleep' for two to three seconds then the red LED will blink on then go out and the damn PM will wake again. I'm thinking logic board...maybe the power supply. Any ideas?