Q: i have ipod 2nd generation and i had reset >  Erase All Content and Settings it is longer than 3 hrs it is still showing apple logo and blink like if it will restart but again it shows the same logo!! is it all right with the erasing...??? i am confused!!

For a 1G and 2G it can take hours. Make sure it is connected to a charging source otherwise the battery can fully drain before it is done. If still problem

Try:

- iOS: Not responding or does not turn on

- Also try DFU mode after try recovery mode

How to put iPod touch / iPhone into DFU mode « Karthik's scribblings

- If not successful and you can't fully turn the iOS device fully off, let the battery fully drain. After charging for an least an hour try the above again.

- Try on another computer          

- If still not successful that usually indicates a hardware problem and an appointment at the Genius Bar of an Apple store is in order.

Apple Retail Store - Genius Bar