apple tv 4k using tvOS 15.1.1 is blinking constantly and won't restart

I have unplugged the unit, let it sit overnight, and plugged it back in. This didn't work. I recharged the remote, and held down "menu" and "tv" button for 10 seconds. This didn't work. Tried plugging in HDMI cord to my apple laptop just to see if it would show up anywhere on my computer. Nothing. Any other ways to force this thing to restart?