I’ve installed Windows 7 64-bit on my MacBook, which required ripping my factory Win 7 DVD (yes, I’m hosting a launch party) and recreating it without versioning numbers (see Jowie for similar problem fixes).  I’ve actually really liked it.However, twice its gone somewhere bad while sleeping.  I actually think the problem is that it wakes up while closed and goes back to sleep, causing some indeterminate state.  The problem is that I have tried to use the power button to turn it off and then back on.   When I do, I hear the boot sound, but no booting seems to occur.Here’s my solution.  Turn off the Mac (hold the power button until it switches off).  Hold shift while you turn on the machine.  Apparently this clears the dynamic bootloader and all things come back together.If this worked for you, please leave a comment below.–Ben