I got an iPod touch given to me. The screen was cracked in 3 corners so I got the replacement screen to fix it. I put it all together, but now it's just black screen. When I press the home and off button a white screen will appear then go out. Same happens if I press the home/off/and up volume button. I tried plugging it in to restore it and it said error, so I'm confused in what I need/should do. Do I just go buy another one or can I fix the problem??