I'm actually sending my Strix 3090 back as I'm having the black screen issue on boot too after 2 days. Turned system on today and black screen, I managed to get it to post once but after a few seconds black screen.
I tried different riser cables, direct plugging, different power plugs, different display port cables, different monitors entirely etc - Can't believe it to be honest after 6 months of waiting the card I get dies after 48 hours. I hadn't overclocked it or anything, just running it stock.
Guess I'll be back in queue soon enough.
I know its probably stating the obvious, have you another MB you can try, or better, a totally different Rig. Also try another Bios?
Last edited: