[Solved] X2 sees my interfaces but I've completely lost audio in or out!

I've run out of ideas short of a clean install... any thoughts are appreciated!
 
At some point, audio stopped working. 
Sonar sees my interfaces but won't pass audio in either direction.
Both X1 and X2 are installed and act the same way.
I only use basic features and a 'normal' template.
I normally keep Windows sounds off of these interfaces.
No other software is running.
 
- During audio recording, X2 shows no activity.
- Playback of an existing track is silent and shows no levels.
- Interfaces are Edirol FA-66 and Roland Quad-Capture (Only one is connected at a time)
- I can select them in Preferences.  Mfg. drivers are installed.
- Input, Output, Timing master, ASIO, levels, mixer routing, settings all look OK.
- If I enable Windows audio, I can record and play through these interfaces.
 
System:
Sonar X1/X2, i7-CPU 12Gig-RAM, Windows 7/64.
Me:
Cakewalk dabbler since CW 2.0 for DOS.
 
 
Thanks!!!
Pat
 

Andy,
They were never connected at the same time.  The QC replaced the FA66, but the problem appeared before that.
 
I had toyed with the idea of multiple interfaces, so thanks for setting me straight there!
 
Kind Regards,
Pat
 

Thanks Andy,
for the kind offer but I've got to get ready for work.
 
The only thing I haven't looked at are Sonar's audio configuration files..
Failing that I'll probably move on to reloading both Windows and Sonar.  What a joy that won't be!  
(I purchased X3 but haven't installed it yet.)

Glad it's working for you now Pat.
 
Alan