Startup problem with Lion OS 10.7.3

Just recently, I've been experiencing a startup problem with Lion. I don't usually have any issues running my Mac, so I'm at a loss why this is happening now.
I have an Intel Mac Pro running 10.7.3. I usually leaving my Mac running all the time and only restart when the need arises. In addition to being my main computer, this mac alsocontrols a MacMini that serves as a music server thru screen sharing.
This past weekend, I restarted my Mac and could not get past the grey screen. The mac chimes, the apple logo appears with the spinning gear, the blue screen briefly appears, but instead of progressing to the desktop it reverts to the grey screen with a repeating cycle of the spinning gear appearing (spins for a while, stops, disappears, reppears spinning, stops, disappears, over and over) - never progressing beyond that stage.
I decided to reinstall the system and things have been fine for the past few days. Today, restarting again resulting in the same problem.
I've tried several things without success. I disconnected all peripherals, reset the PRAM/SMC, ran Disk Utility from a install volume and ran repair and permissions (no problems reported). Tried safe mode startup - a progress bar appeared but never fully progressed and could not get to the desktop.
Recent changes included updating the OS to 10.7.3 and Adobe Photoshop CS5.5 - no recent hardware changes. No bluetooth devices connected.
Any thoughts? Thanks -

Thanks -
I've reinstalled the OS today and am back up and running.
But, since this is twice this has happened within the past week, I'm worried about might be causing this issue - besides bad luck. My Mac is usually rock solid - can't remember the last time I've had to reinstall the OS in the past few generations of OS X.

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