It won't even run without the shield. There is a mechanism that prevents operation without it in place. kunga10 (AIM) kunga47 (Yahoo Messenger with Cross-Platform dial-up Video sans audio on Macs) On Monday, August 11, 2003, at 07:02 AM, Jeremy Kezer wrote: >> 5) It looks cool running with the door off > > If you want to do this to admire the guts of the G5, make sure the > clear fan shield is in place. Otherwise, the unit will reduce its > performance to keep the processors from overheating.