My video keeps going on and off
How do I fix my Wii's video from blinking on and off?
What exactly is blinking?
There's a couple of things you can reset.
1- The red reset button in the front hidden panel.
2- Try reseting the power brick, by unplugging it from the Wii and the wall power for 5 minutes.
Also double check your wires and output settings (especially if you recently changed TVs).