Endless loop on iMac after OS update, wont recognise wired USB mouse

I just installed an update on my 2010 iMac, running 10.7.5 and it completed successfully, but now I am stuck in an endless loop on startup. The dialog that shows up over the startup screen (user icons showing up correctly behind it) is from the Bluetooth Setup Assistant, and is titled "Bluetooth Mouse or Trackpad Setup". Its telling me there's no wireless mouse or trackpad connected, which is absolutely true. I prefer wired mice and don't use a trackpad with my iMac. There is a Logitech USB mouse attached that I've been using for a long time, it worked fine immediately before the update. It was plugged into my Apple wired keyboard, but I've also rebooted with it plugged into the Mac directly thru a USB port on the back. Same thing both ways.
Its now looping endlessly, saying "Attempting to connect with mouse #1 (hex code follows in parentheses)", then it says "No wireless mice or trackpads have been found. Make sure your wireless mouse is discoverable", then it goes back to the attempting to connect, and so on...
Anybody got a way out of this??

Wow. Would never have believed that was possible (that's why I didnt consider it...). It appears that indeed the software update itself fried the mouse. The same mouse whose last click was to click the "Restart" button on the software update dialog. A different iMac won't recognise it either, and the mouse from that Mac breaks the endless loop from the Bluetooth Setup Assistant. Looks like I need to find a new mouse, I wonder if I can still find one with a wire...
Any thoughts on whether this was pure blind coincidental failure, or is there some way a restart itself could damage a mouse somehow??? Hard to imagine the software did it per se, so perhaps it was one final reboot that broke the camel's mouse's back?
Thanks, Linc.

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