I was using the facebook app when suddenly Ipod froze and white screen appeared. I tried holding the lock buttong and home button together for some time but didn't work, tried to restart but didn't work either. I plugged it in itunes but no luck. I'm using Ios 5.0.1 jailbroken by redsnow. Ipod wasn't dropped or anything like that. Any idea what is the problem and how to solve it?