ZX6971 - won't power on

Hi everyone -

I have a Gateway all-in-one ZX6971 that won’t power on. While the power brick will have a solid light on when plugged into just the wall, it starts flickering when I plug it into the computer. I’ve tried another power supply with the same results. No indication of life whatsoever from the computer itself when holding down the power button.

Any help is most greatly appreciated.