Old 2nd gen... Battery depleted but after plugging it just wouldn't go pass the Apple logo, and wouldn't charge either (after several hours still red). Can't understand why charging has to be dependent on software working... Anyhow did a soft reset (Home + sleep button hold) as some suggested and it came back to life and started to charge.
Some people just got instantly defensive when seeing complaints about Apple stuff (see the "Creative One" guy here). Weird.