No sound Suddenly Trouble

Hi. Me again. eesh. So even though everything worked perfectly yesterday, for some reason today I can't hear any sound in protools. Playback appears to function but no sound comes out. My speakers and headphones work fine with everything else. A few weeks ago I was having software problems of a different nature and called PT support. AFter much troubleshooting we couldn't solve the issue, and they suggested I try buying an official avid-approved sound card. So i did. And after I installed it, everything has been working just fine. Until today. AS aforementioned, I can't seem to get sound today.



Any suggestions?



May