For Sale/Trade: Original Quad Core Intel Mac Pro 1.1 - Model A1186. With 6 GB RAM and faster ATI Video Card. Two hard drive sleds installed. No hard drive installed. Limited to OS X 10.7, although hacks to El Capitan are out there. It is possible to update the SMC and upgrade the firmware to v2.1. Have had two hard drives display the question mark on boot. This Mac does boot chime OK, but probable SMC issues. Sold as is for parts, or for trades (PC tower, hard drives). Stock photo.