Why my mbp turns black screen when use win7

as I start win7, screen black... the system is still running because i can hear the sound...and the keyboard is light as well...
does any body know why?
Pleasssssssssssse

Do you try booting in Boot Camp or Parallels/VMware? (If you have the backlit keyboard, I assume it is virtual as I don't get backlighting until Windows has been logged in).
I would restart your Mac, hold the alt/option key before you hear the startup sound. From the boot screen choose windows and press and hold F8 immediately. This takes you to the Advanced Boot Options. Here you could try Repair Your Computer or Safe Mode. If either of those work, then use the Windows restore function, found in control panels or from the boot options screen.
If this does not work, try asking the question in the Boot Camp Community. They might know more.

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