Q: itouch 3rd gen won't start/charge

I went to charge my itouch yesterday and it flashed a yellow triangle warning (which disappeared before I could read the message) and now it won't charge or turn on.  I have tried holding the home button for 10-20 seconds, I have done the same with just the power button and also holding both home and power button.  I tried plugging it in (with the original power cord and with a newer apple cord) to my computer and also to the wall with the apple wall adapter and an after market adaptor.  The device doesn't register on my computer so I can't reset it through itunes.  Help!  I'm at a loss :-(