hi ,I'm new here in MacRumors seeking help from my iphone 4 after I delete cydia from my phone, my phone turn blackout ,if I turn it on only the logo apple appear and blinking slowly off and on I try to restore it thru my pc but my itune cannot detect it, what should I do ,to bring it back again and restore it from the original, please help. step by step cuz I'm not really a pc genius.