Hello. I feel stupid writing this as I really dont know what to do. Im good with iDevices. Anyway im doing my friend a favour. She mentioned her iPhone 4S wouldnt turn on or be recognised in iTunes. Ive been trying for ages and nothing. Ive asked her and found out she had it Jailbroken. Nothing happens with the phone when not connected (Total black screen). No matter how long I hold down the sleep/reset button. So, Ive put the phone into DFU mode and reconnected it to iTunes. It recognises it as being in recovery mode so I restore. It downloads the software but then comes up with the error saying iPhone not recognised. Please guys. Im stuck. im usually really stubborn to admit I dont know something but im annoyed with myself with not knowing what to do next. PS. Shes not bothered about losing stuff on the phone.