My iphone 5 locked up while upgrading the iTunes software and wont reset or turn back on
I was upgrading the iTunes software on my phone and received an error that the USB Hub was not working properly - I was instructed to unplug the USB charger and select reset then continue. This did not work and locked up my phone and computer. I was able to restart my computer but if I try pluging in my iphone charger to continue the software upgrade it happens again. The problem is that my phone is locked - I have tried holding the on/off and open button to do a hard reset but it takes me to the screen to connect to iTunes - then goes back to a black screen - how do I get my phone back on?
iPhone 5, iOS 7.0.4