I have a 16Mhz crystal hooked up to an Xmega and I can't get it working right. It works fine with the internal oscillator but when I try to get it to use the external crystal it just doesn't do anything.
I tried to probe it and I discovered that it will start working while my probe is touching a particular lead of the crystal. The scope shows a nice 16Mhz sine wave, but as soon as I pull the probe away it stops working again.
I've built several of these boards already and I've never had this problem so I know it's not a design issue. Any ideas?