After a time or cycles of recharging... batteries wear out. My suggestion is to replace the battery

Have you tried a hard restart....? Hold lock and home for about 10 seconds. Generally with most Ipods that i work on i some how bumb either home or lock while it is off it boots while I am repairing it... and then acts like a brick.... So if you would... hold lock and home for about ten seconds and it should boot... If not... then you might have ESD'd the device.... ESD is eletro static damage, your body can have a charge of several thousand volts, and then pass this charge to the device. To see the spark, such as when you rub your socks on the carpet it has to be at least 20,000 volts. meanwhile...your device will be harmed with as little as 12 volts. Update: With ESD in my experience it is DIFFICULT beyond all reason to find where the damage is. With the I pods...I would make sure that there is a signal going from both buttons to the logic board and the cables going to the screen and digitizer. Charge the battery? After that either new ipod or new logic board....

I would suggest a lint free cloth, there are some really good microfiber cloths that are antistatic. As for a liquid, I actually do not suggest using water; What I use is Denatured alcohol.

Can we edit this to say 4 screws?