Press and hold the Sleep/Wake button and Volume Down button simultaneously for at least eight seconds or until the Apple logo appears. You may need to repeat this step.
If the above step did not work, try connecting iPod to a power adapter and plug the power adapter into an electrical outlet, or connect iPod to your computer. Make sure the computer is turned on and isn't set to go to sleep. Try resetting the iPod while it is connected to power.
If neither of the above worked, your device has a hardware issue. There is no key sequence or software fix for a hardware issue. You will need to setup an appointment with your nearest Apple Store Genius Bar (http://www.apple.com/retail/geniusbar) to get it serviced.
There are no other options.
The above are the only answers to your question of how to get your device from a stalled state.
Let me know if you need further assistance.