running parallels desktop 2.5 build 3188 initial black screen says "Boot from hard drive..." and is hung there. running mac os 10.4.11 on a macbook pro with 2gb ram. the parallels hangs the mac, the mouse disappears, and cannot get to the menu bar for parallels. the mac responds again when i switch focus to some other application (eg, finder or safari) can only get out of parallels by rebooting the mac. parallels had been working fine, but now i cannot get into it. how can i recover my virtual machine?