Why does my Mac Pro boot to a white screen?

Hey everyone,
So recently I have started having this issue with my Mac Pro system. When I power it on, I get the chime, but no loading screen. Just an all-white screen. If I power it down with the power button and turn it back on a few times, it will eventually boot normally, but I should not have to do this. Obviously this is not normal operation. So, I was wondering how I could fix this? Below are the specs for my machine:
System Type Mac Pro (Version: MacPro5,1)
Processor Type: Quad-Core Intel Xeon 3.2GHZ
Memory: 10GB
Boot Drive: 128GB OCZ Petrol SSD
OS Version: Mac OS X Lion 10.7.3
Any ideas what would cause this and how I can correct it?

Forgot to mention my troubleshooting steps thus far.
Originally the issue started with freezing. System would freeze after about 5 minutes of use. First I verified permissions and disk. Some errors were found, so repaired as needed. Did so using my OS disc. Rebooted and issue still existed, though not as bad. Did another Permissions and Disk check, this time from within the booted OS. More issues found, so repaired. Rebooted and seemed to be fine. Updated software to latest version and created a backup image of my system just in case. Rebooted and seemed OK. That was on Wednesday.
Thursday night I try to boot up and get a white screen. Odd. Powered down and powered back on. Worked fine. Did what I had to do on it and shut it down like normal. Came back later and same issue. Powered down and powered back on. Same issue. Repeated and worked this time. Checked permissions and disk again. No issues found. Just tried reseting the NVRAM/PRAM. Seems to be working OK, but not too sure yet. Will test for a day or so and let you guys know. In the meantime, any suggestions would be helpful. System is covered by Apple Care, so if I absolutely have to take it in, I can.
Thanks in advance all!

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