Mac Pro will boot but won't restart.

When waking up or doing a soft boot my Mac Pro will chime and sound like it's booting but the display will never come on.
If I do a cold boot, or even hold down the power button to force it off and then boot it's fine. I've tried turning on and off and plugging and unplugging the monitor. I've repaired permissions and reset the SMC and PRAM. It's been happening for a while, but now I want to install MacFUSE and it requires a restart to finish installing.

Which model Mac Pro? GHz?
How much RAM?
What display card? What display?
What USB devices (these have a strong reputation for interfering with sleep)
What FireWire devices?
Have you run the diagnostic on the Installer DVD to rule out Hardware problems? Instructions are on the face of the DVD.

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