rx6750xt

first time this happened was maybe a month and a half ago, playing minecraft and had lossless scaling enabled then black screen. i noticed that whenever using lossless this happened bnut was told it was my error and not the program's so i stopped using it for awhile. now it just happens randomly...

So 3 days ago I took my gpu out of the computer to have it cleaned up, and tried to boot up with the igpu, but got nothing, so I plugged the gpu back in and tried again; still nothing. Tried different sets of ram in all slots, that I'm sure are working, no post. Tried disconnecting all...