See here for my repair
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1256229321

Sorry it took so long to see this.
Here is the part on Ebay

http://shop.ebay.com/?_from=R40&_trksid=p5197.m570.l1313&_nkw=mbr0520&_sacat=See-All-Categories

Found the Diodes on Ebay: 25 of them for $2.70 shipped, out the door cost.
So if you need one contact me and I'd be glad to mail you one or two if you pay the $0.44 postage. I only needed 1 of them.

Here is my completed repair picture, the chip is working awesome and is once again protected from stupidity (To an extent)

Yep that was EXACTLY it!
Pulled that Diode made a tiny jumper and my unit is back online via USB power like it never happened.
I may order another diode for it on my next order with Mouser, I just dont want to have to pay shipping for that dumb $0.20 part.

But for now I'm back in action, and I will try not to do anything stupid until I have that diode replaced.


Here is the pic of my repair for others that run into this issue...
PS: This is V3.0 Nano

Yep same stupid move lastnight! Thought my unit was toast.
Went a googling, and found this thread, sure enough if you supply 5VDC on the VCC pin this chip is fine and I can even program via USB but it just won't power off USB anymore.

Going to go look at the diode you guys are talking about and see if I can jump it or replace it, thanks a TON! Imense help!!!

And yes I'd say that diode is a tad touchy and needs a replacment product on v4