Hello. I am in a bit complicated situation. I have a MacPro 2013, 12core, 16gb ram, and D700 gpu.
My Mac is doing wierd things. I wanted to try new Beta osx. After few days of instalation I noticed that my mac is can’t restart. When Mac goeS in restart cycle it just goes to black screen. Power button LED lit. I had to switch it off. But that is not all. After that I can’t just turn it on, I have to unplug mac from power and remove ALL usb devices inc. keyboard only then Mac goes to normal boot. I tryed to dowgrade OSX to Big Sur, but I could’t because I have to remove all USB devices to get Mac to turn on. Eventually I managed to dowgrade changing boot drive to USB in terminal. I thought every thing was fine, bet then it started again. I can’t even update Big Sur to lated version because when I hit restart in instalation process Mac goes to black screen. Tryed to boot in diagnostics mode no lack because keyboard needa to be unplaged. Can’t clean SMC cus no keyboard.
Can someone help me?
I also checked all diagnostic LED on all the boards. No error showing there.
Don’t know is it software or Hardware related isue.
I can run All core CPU stress test, full RAM stress test and GPU heaven test and leave them all runing overnight, and everything ir ok. Temps are normal, tests has no errors….
p.S sorry for my english