I my first Mac Pro, second hand. It is a 2008 Mac Pro 3.1 with dual 2.8 ghz cpu. I absolutely adore the design. It is so beautyfull. But.... It powers on nicely, fans spinning, lights on the RAM boards blinking, but no picture and no beeping sounds. -have tried moving the 2600 graphic card around, -tried both of the DVI outputs. -Tried two different sets of ram modules, -resetted NVRAM What else could I attempt? Different set of CPU`s? Different graphic card? I should get a beep or something regardless of HDD present?