Can you hold down Alt and SysRQ and press S and then B when it is stuck?
 Does that immediately reboot the machine?

Also try suspending from the console instead of X:

1)  Press CTRL-ALT-F1 to switch to the console
2)  Run sudo -s
3)  Run echo mem > /sys/power/state

Does this resume?  Press CTRL-ALT-F7 to switch back to X.

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https://bugs.launchpad.net/bugs/760842

Title:
  Natty Narwhal/Sandy Bridge Suspend Fails

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