Ok so I installed my brand new shiny X3 into my brand new shiny Xbox. I have a 1.6MB. Installed the pin header the jumpers and everything. Ohmed out the pin header to points on the motherboard to ensure that everything was making good contact. Well much to my dissapointment my brand new shiny Xbox when turning it on, turns it-self off and on a couple of times and frags. I didn't replace the the original HD was waiting to make sure everything went ok. Removed everything and won't boot to the M$ Dash. Put everything back in still no help. Just wondering if anyone had any suggestions. XBox manufacture date is 2004-09-20.