I have a Power Mac G5 here are the specs: Hardware Overview: Model Name: Power Mac G5 Model Identifier: PowerMac11,2 Processor Name: PowerPC G5 (1.0) Processor Speed: 2 GHz Number Of CPUs: 2 L2 Cache (per CPU): 1 MB Memory: 2.5 GB Bus Speed: 1 GHz Boot ROM Version: 5.2.7f1 I am having a problem where the machine will boot up only after it has been unplugged for about 20-30 minutes. Once I boot it up, it is able to be restarted with no problems. And when I say restarted I mean executing a restart for the menu. The problem is when the machine is shut down completely it will not reboot until it has been unplugged for 20-30 minutes. Can someone please tell me what the problem may be and how to resolve the issue? Thank you for your time.