O, you can still login remotely! That changes things - a lot!
But I'm still confused. Just for clarity, I'm trying to find out what's going on, which should be one of these:
1. Stereo Tool hangs. In that case, closing or killing and then restarting it should fix the issue. No Windows restart needed.
2. Sound card driver in error situation. In that case, restarting Stereo Tool might not help and you might need to restart Windows. Or not.
3. The whole PC is locked up, and does not respond to anything anymore. Can be caused by hardware or OS/driver errors.
Now:
Quote:
I was unable to restart Stereo Tool without rebooting the computer. The screen was frozen and discolored. No commands could be given (no buttons pushed).
Was this on a remote login - and if so, were you already logged in when it happened? Or was this directly at the pc? I originally read this as 'the whole pc is dead' - but again, if you could still log in then it wasn't. And those buttons, was that buttons in Stereo Tool or anything in Windows? (I expect that you have at least tried the red X to close the window? And potentially to start a Task Manager?).
I originally read this as situation '3' but if this was via a remote login - and you could still log in AFTER the audio stopped - it looks like it could also be 1 (or 2). So, please clarify what happened exactly.
Quote:
As you know, Stereo Tool's on screen display is very colorful. When the program was frozen, everything was more greyscale than color. The computer is in a climate controlled room that never gets over 74 degrees F. and it has a large internal fan.
That sounds like a hangup inside Stereo Tool (either due to a bug in Stereo Tool or a sound card driver error), but Windows 7 normally shows a popup when you try to close a program that hangs (after a few seconds). And you said that you couldn't stop Stereo Tool so it cannot have been that.
Quote:
I think Phil is saying the computer just freezes (locks) and only a reboot will get it working again.Sounds like a driver issue.
But that doesn't explain that he can still log in.
You also wrote a few times that you weren't 100% sure of what you did anymore, that really makes it hard to figure out what happened...

Also the '41' error that you saw in your Windows error logs before really indicates a hardware (power) issue. Which might even have caused this new crash without being logged (you never know what happens when the system hangs).
Potential causes:
1. This would be either a bug in Stereo Tool or a bug in the sound card driver. Since I'm not getting other complaints like this, my guess would be the sound card driver.
2. Definitely the sound card driver.
3. Hardware or drivers, but not Stereo Tool
You never answered if you're using ASIO or non-ASIO for the sound card, switching might help (my experience with other sound cards such as the ESI Juli@ is that ASIO has less issues than normal I/O).
Phil, please try to answer things as precisely as possible... You know those diagrams where you have to answer a lot of questions and end up at a solution? If you give the wrong answer even just once, you end up at a different solution!