iMore

I have jailbroken iphone 3gs 3.1.2 and everything has been going well until tonight. I tried to sync my phone with itunes and a message came up that said, "itunes cannot read contents of iphone, click restore to restore to factory settings". The only thing I have done since my last sync was change the root password, which could have been the culprit. I am not sure what I can do at this point, I dont want to restore because I will lose my jailbroken status. If I dont restore then I cannot sync my phone anymore. Has this happened to anyone else? What can I do to fix it?
Any help will be great.
Thanks