problem sovled!
it finally started..!
ONLY connected on display port on the gfx card (3090)
previously i was trying to start it using a old spare monitor on hdmi, the 3090 has hdmi 2.1 the old monitor does only other old hdmi standard..
if you have everything installed and connected, make sure you are using display port cables or HDMI 2.1 on an 3090rtx