Hi there, I updated to Mojave a while ago and recently installed windows on a 2nd drive. Using the Boot Camp Control Panel and startup disk was working fine until yesterday. Now I have no video but signal on my HDMI and no signal on my DP. I get chimes and fanspin but that's it. GPU OK is off... My thought is to replace the video card to test, but I don't have any handy and I'll need to purchase one. Would you recommend I start there? Thanks!