Thanks for all the help!
Re-bootload it, and then upload the bare minimum sketch. Does that upload work?
Yes, also works with the heavy 3dprinter program.
when you press reset, the light blinks a few times.
Damn, mine doesn't do that. The orange light is up all the time. When i press reset, it just turn off for milisecs, and then gets up all the time again, no blink pattern.
Is anything connected to pins 0 or 1, or to reset?
I've tried both. Without anything connected and connected to a arduinomega shield called 'Ramps 1.4'.
If you load a program via the Icsp (?) connector.
Not that case, I've used this schema using a Uno as a programmer:
