hi everyone i have recently bought a mac pro model (A1186 2113) with intel xeon 5150 and 2gb of ram and a 250 hard drive. after using it for a few days i noticed some issues 1) won't boot unless you try it for a few times. i read about this online and they said something with capacitors or power supply to be replaced. 2) the computer can not update past mac os 10.7.5 even though the model and the CPU is 64 bit compatible https://ark.intel.com/products/27218/Intel-Xeon-Processor-5150-4M-Cache-2_66-GHz-1333-MHz-FSB. 3) i can not update past firmware 2.1. is this why i can not go past mac os 10.7.5 i do not know what to do can anyone help me and guide me in the right direction.