Hey Guys, several year lurker but first time poster. I've got a problem that I've never come across before. I have an iPhone 4 on 5.01 jailbroken with Absinth 0.4. Today it randomly turned off while I was using an app. Couldn't get it back on so I just figured I would wait until I got home and put in DFU and then reinstall the OS and rejailbreak (which I've done many times before). But...the phone won't go into DFU. It's not recognized by TinyUmbrella where I have my old SHSH stored nor is it recognized by iTunes. I've googled for hours and I can't find anything to help. Anyone with ideas? The battery is fully charged by the way and I made sure the USB port is working on my Mac. Thanks for the help. Forgot to mention, there's absolutely nothing happening on the iphone screen.