Gray Screen, no apple logo, bread & butter mac, need help

While I was working on my Mac Pro the Apple Raid utility popped up with a warning that "2 serious events had occurred" One of the messages said something about the drive in carriage 2 had been removed... I closed Raid Utility and restarted (had to push power button until shutdown, then push again to start) only to keep getting a gray screen - no apple logo, nothing just a plain grayish-white screen. Could hear raid drives initiating, not sure if all were winding up. Tried resetting PRAM, SMC, etc... no luck. Tried booting to external drive (opt key), nothing, just a plain gray screen. dvd drive door wouldn't open, so manually opened it and put original install dvd in, restarted holding down C key, nothing, plain gray screen, won't boot to install dvd. Also tried booting to target disk mode, no deal, gray screen. RAID was configured 0 with one drive J+ and other three as one volume.
Thanks in advance for any help,
John

Okay, I pulled all the drives and booted with bootable FW800 attached and with orig. install DVD loaded. Boot options screen popped up! I was also able to boot to Diagnostic on install dvd. So, I skipped the hardware test and installed drive 1 in bay one. The OS was on this drive as a J+, other 3 drives were RAID 0 volume. Again, attached FW800, left DVD loaded. This time the J+ drive in bay one showed up in the boot options... so I selected it and the MPro booted as normal. At this point I thought it wise to retrieve the events log from the RAID Utility. The following events occurred within seconds, in the following order:
"Drive 3:5000c50007da55af missing - Replace immediately or acknowledge loss of RAID set RS1 and associated volumes"
"Drive carrier 00:02 removed"
"Non-viable RAID set RS1 and all associated volumes are offline"
I assume this is telling me that Drive 3 (bay 3) failed. I think my next steps will be to
1. Leave the J+ OS drive (drive 1 / bay 1) in.
2. Insert drive 2 in bay 2 and try starting up
3. If that works, repeat 1 & 2 above with drives 3 and 4, using bay 2
I would deduce that if one of the drives causes the gray screen previously experienced it is the culprit.

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