So I have this used Mac Pro 5,1 (Mid 2010) which is behaving really weird. When I turn it on there is no video or chime, the fans turn slow/normal and it just stays like that forever. The USB ports are powered on after about 20 seconds, which is really weird. I tried the minimum configuration and used the Diag LEDs to troubleshoot the Mac. They're all acting like they should. I even tested with a working Mac Pro 2010 and switched every Part in it. PSU, Processorboard including CPU & RAM, GPU and Hard drives work completely fine in the other Mac so the issue can only be related to the Logic Board / Backplane even though the DiagLEDs tell a different story. Can the Backplane be saved? I am not really into Macs but I'd like to make this work again as it's meant to be a gift for my dad!