ssatterthwaite

I have a two week old or so N+2 running 4.2.2 and it worked great until this morning.  It now won't show up as a USB device even if I hold the button on power up.  The blue light is always on when I apply power either from USB or an external supply.  So I can't see it from the DFUTester app, MF Deploy, or in the device manager. I've tried 3 different USB cables with no better results.  Is there any recourse: boot from sd card, hard reset, etc?  I've rebooted my development machine (win 7 64) as well I'm fairly careful with static precautions, and I've got it mounted on a lexan board with standoffs.  The last thing I was working on was connecting to a 20x4 LCD display.  Maybe I pulled too much from the 5V on the N+2 for the backlight? Any help would be appreciated.  I have read some other posts with brick situations but I believe they were able to have some USB connectivity to recover. BTW, I've found your forums to be very helpful, and everything has been working well up until now.  I'm using mine for the basis of a beer brewing control project.  I'm using PT100 RTDs for temperature logging and am planning on running a PID controller for control. thanks! Scott