PC/iTunes wont recognize unlocked iphone3gs
Im new here and im stuck at the moment.
I jailbroke and unlocked an iphone 3gs which was on ios5 by downgrading to ios4.1 and baseband 06.15.00 and Everything worked fine.
I gave it to a friend of mine on loan for 2 weeks and when i got it back i did a wipe/reset.
My iphone got stuck on the apple logo and i cant get it sorted.
I understand i need to restore again but my PC & laptop wont recognize the iphone, neither will itunes.
Ive tried just about everything at this stage including holding down power and sleep combo to get dfu mode , changing usb ports, leads etc.My screen is going blank but itunes wil not recognise it so i cant restore it.
Ive tried Tiny Umbrella and Redsn0w again but again it wont recognise the iphone
Ive tried restarting apple mobile device and ipod service in "services.msc" but still no joy
I might be getting dfu mode but i have no way of telling.
Ive searched the net for the last few days and this is doing my nut.
Surely if i can get my pc/itunes to recognise i can restore it again back to 4.1.
Can anyone help with this please?