Aten cubiQ / doesn’t work with sceptre 4k monitor / no sound on hdmi (17-04-19)

Already have this at my office also got another one at home. Seems to have problem with my sceptre 4k monitor. The display seems to be flickering. Also doesn’t seem to have sound with my gigabyte brix mini pc. I thought the speakers on the monitor was spoilt but it seems to be the problem of plugging in the audio port. As the hdmi was already able to transport sound. It seems like removing the audio jack from the gigabyte brix seems to solve the no sound problem.