Mbox Problem

[n3xus]

I have had my Mbox for about 4 1/2 years now and have never had any problem with it. I launched Pro Tools 7 and for some reason it took a lot longer than usual to load the DAE. When I started my new session and went to record some guitar, I could not get any monitoring within Pro Tools on either channel. My cables all work fine and the amp is working fine. I tried the keyboards, same thing. I tried to play some audio from a different session, when I hit the play button, I got an error saying "Problem detected with audio clock. Check that your clock source and sample rate are correct". Under Setup>Hardware my clock source is set to Internal as its always been, and I always use 48k sample rate. No recent hardware or software changes on this system other than uninstalling and reinstalling Pro Tools when this all began. Has my Mbox finally bitten the dust?