Hi, Well, I got hold of a 'scope and checked out OSC2 - it's sitting at a DC level of 1.2V. Not moving at all. OSC1 is also constant - at 0.15V. What could this mean? The crystal is connected across OSC1 and OSC2, and has a 30pF capacitance to ground on each leg. The ground is a plane layer in a 4 layer PCB. I'm driving my circuit with a 3V power supply, and I've checked the power connections around the chip. /MCLR is high. Interestingly, the LED I've connected between RE0 and ground glows dimly when I turn the circuit on - why is this? (The PIC code is supposed to drive all of port E high when it starts executing, but I don't think it's getting this far, based on what I see at OSC1 and OSC2.) I've checked the configuration bits - they're set to HS oscillator with LVP Enable off and Debug off. Any ideas? Kieran