2010 mac pro 5.1 display stopped working & will not come back on
2010 Desktop Mac Pro 5.1 was working great for years. Still using Snow Leopard 10.6.8
for making use of music software. Machine started acting odd by screen sometimes not coming on and having to restart. It worsened until one day it just would no longer come on at all. I purchased a new Radeon HD 5770 because everything on the net said the card was most likely the problem. It is not the card. After replacing it, the machine chimes it is on, but screen remains black. I use the mini port with an adapter to HDMI. Checked the cable, it is good. Tried a different cable, same thing. Monitor works fine as TV screen. What do I look for next? Everyone has phones now. All the Mac fix stores are gone. I want to stay with the desktop. My screen is 32” big. I like it like that so I can see the music I write. Also the software demands 32G of RAM. A little pocket phone can not do the job. Please Help.