Only see grey and white stripes and some other colored dots on screen when turned on
Yesterday, when I tried to use my note 2 in the middle of the day, I found the phone stuck at the Samsung galaxy logo. I took the battery out, then put it back. This time I won't even able to see the note 2 logo when trying to turn on the phone. All I have seen is a relative grey screen with white horizontal stripes parallel to each other and some dots in different colors randomly scattered on the screen. Tried to hold VOLUME + Home + Power, I was able to enter the warning screen and see the warning clearly. So I don't think it is something wrong with the screen. Installed odin on my PC, but it seems the phone is not detected by odin.
1. Have I lost everything on my phone?
2. What can I do to fix the problem?
3. If I lost all the data and apps, how do I get all the apps back after I can restore/reinstall the android?
Thanks for any help in advance. And suggestions, helpful links are appreciated.