Grey screen forever - very weird

Last night I shut down my mac pro after having it on for many days. Everything seemed fine although it was a bit sluggish. When I turned on the computer today, there was a chime and then it would just go to the grey screen. No spinning or loading bar.
I tried resetting the PRAM, restarting in safe mode, holding down option button. Any action that required the mouse or keyboard didn't seem to give any response. It would stay on the grey screen. This has happened to me in the past but I was able to get the snow leopard disc and do a disc repair. I can't get the disc tray open no matter what I try this time though.
What can I do? First of all, I'm worried that this has happened now a few times now. Each time has gotten worse it seems. I'm frustrated that there is no manual open tray button so I can try to run the OS from the disc. I browsed through many topics and some thought maybe it was the 3rd party RAM but I took those all out and that is still the problem. My drives all seem to be healthy so I'm not sure what is causing the problem. Maybe I have to replace the main Mac HD drive. Please help. I can't take it in to repair... no money in this economic time.

Your tray should open if you hold down a wired mouse button as you restart your Mac.
Then, Try using Disk Utility to do a Disk Repair, as shown in this link, while booted up on your install disk.
You could have some directory corruption. Let us know what errors Disk Utility reports and if DU was able to repair them. Disk Utility's Disk Repair is not perfect and may not find or repair all directory issues. A stronger utility may be required to finish the job.
After that Repair Permissions.
No need to report Permissions errors....we all get them.
  DALE

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