How do I reboot my iMac in Lion? Right now it opens a black screen with dos and asks me to insert the boot disk.

How do I reboot my iMac in Lion? Right now it opens a black screen with Dos and asks me to insert the boot disk.I recently installed Parallels & Windows 7. Now if I have to turn the system off, it starts up as per above in Dos. know I need to start up and press a couple of keys, but which ones? I forgot....

A simple search around here, identified this thread https://discussions.apple.com/message/15762361#15762361
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