Ipod Touch 3g Got hot and now won't turn on

I have an iPod touch 3g, 8gb's to be specific. I forgot the password to get into it, so I plugged it into my computer in order to reset the whole thing. I plugged it in and it connected, but after three seconds or so it disconnected. I tried plugging it in again, but the computer didn't notice anything plugged in.

I looked on the internet for some advice and I learned that I could hold the power button and the power button at the same time for somewhere between 5 and 10 seconds to restart it. I did that. The iPod turned off, but it got really hot and now won't power on plugged in or not.

What caused this? It's written all over this website that doing that would just reset the iPod, not kill it! Did it toast the motherboard?