When I try to Power on the Virtual Machine by using the green Play icon, I get a message that tells me I need to Restart my computer by holding down the power button. It won't let me do anything else until I power off by holding down the power button. This seems to be a Mac error not a Parallels error. I installed parallels on another computer (same OS 10.4.11 as the other computer) and it worked with no problem. I was able to power on the virtual machine by using the green Play icon. The only difference between the 2 computers is that the one that works is an Intel Core Duo while the one that doesn't work is an Intel Core 2 Duo. I don't understand why this is happening. I uninstalled and reinstalled Parallels on the computer. I also, restored my computer to factory settings but it still gave me the same problem. Help. Anyone.