Cannot upgrade from Lion to Mountain
Hi everybody,
My brother just gave a Mac Pro 2006 (MA356LL/A), he was running leopard 10.5 server OS, I installed mountain (not server) to use it as my desktopand it is running great, Now, My question is WHY I CANNOT UPGRADE TO MOUNTAIN LION, when I try to upgrade it says that that the machine does not support it..
Technical Specifications
Two 2.66GHz Dual-Core Intel Xeon processors
5of 667MHz DDR2 ECC fully buffered DIMM
NVIDIA GeForce 7300 GT 256MB (single-link DVI and dual-link DVI)
500GB x 3 Serial ATA 3Gb/s; 7200 rpm; 8MB cache
Mac Pro, Mac OS X (10.7.5)