ok, I was recomended that I "jailbreak" my iphone by a mate and now i seem to have completely messed up my phone. I followed this youtube video http://www.youtube.com/watch?v=d5M4XWBeaIQ Install Cydia restarted and got everything working, then i install a few apps, after that it told me to reboot. so I did. but after serveral min's/ hours my iphone would not restart. So I started panicing and came across some help online that said I should restore my iphone but its still not working. and now my iphone is complete black screened. Anyone know what i can do.