Arduino turning off when circuit is complete?

Hey, so I'm really new to this whole thing and I just ran into a problem working on a tutorial; my Duemilanove ATmega328 powers down when I connect both 5v and GND to power and ground my circuit. Any idea why?

Your circuit has a short in it. When connecting the Arduino, the on-board fuse is disconnecting Vusb.

Lord, do I feel silly. Thank you! I'll tinker with it then!

Franktea: my Duemilanove ATmega328 powers down when I connect both 5v and GND to power and ground my circuit. Any idea why?

Also, it is very very very very foolish to be making ANY connections while power is applied. The very last step should be "connect the power source." If you don't learn this now, you'll be in for trouble later on.