Premiere Pro Timeline Won’t Play

Recently purchased a Dell Precision T5600 workstation – Win7 64bit, 32 GB of RAM, Quadro 4000 (driver ver. 307.45).  CS6 Production Premium.


Hitting the space bar nor hitting the play button on the program or source monitor will play a video or audio file.  Play icon changes to the square icon but nothing happens.  A week or so ago I had the same issue.  I uninstalled and reinstalled the suite to get it to work.  Now the issue has cropped up again.  Audition and AE seem to work fine.   Only seems to be an issue with Premiere. Any ideas?  Any help would be appreciated.

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