Suddenly no mic input level thru mbox

I have been recording vocals successfully in GB 2.0.1 through an mbox. All of a sudden, with seemingly no change in anything, I'm getting no level when I sing into the mic and record (I just get a "chunk" with a straight line as opposed to the wavy audio line, if you know what i mean). The mbox is still offered as an input choice in GB preferences, the digidesign manager program seems to be working. I've tried opening various songs in GB and recording to vocal tracks where previously i've had no problem - no levels.
And, when I record through my iMic it works (but at a lower quality)
why would the mbox all of a sudden stop working? any ideas? all is the same as far as I can tell, phantom power's on, levels same, on "mic" setting, correct channel. I've tried quitting, restarting the computer etc
any insights would be greatly appreciated!
D

Hi Gerald and Scott,
I"m sorry for the delay - I've been out of town. Thank you both for your replies. As it turns out i think my mbox actually died. Its in for repair now...so we'll see.
I am interested in the driver you mentioned, Gerald. You use this instead of the Core audio driver? I was wondering what is it that you like about this driver in particular? Also, do you pro tools by chance?
thanks
Deb

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Suddenly no mic input level thru mbox

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