I checked that debug is on. I've even tried via the Wifi Settings USB Connection method. The phone will charge but is not seen by the PC. I've tried other PCs and other cables. It doesn;t show up in Device manager and I've also tried the windows drivers for the phone.
The only thing that has changed in the past month or so is that I replaced my Clockwork Recovery module with the stock recovery module and my phone is no longer rooted. Any ideas anyone?