-1 is commonly known as a bricked device. Thy arouses from the baseband chipset for the most part. Sometimes it might just be a hiccup that you can troubleshoot by going into safe mode or by forcing the device to boot a patched kernel or if you force it into recovery using progs like RedSn0w and force it back out of recovery. Do you have TeamViewer? If you do I can help you take a look at what might be the problem. It would help if you had a webcam of some sort so I can see the device physically