MY Wii Console wont power up and everything is connected?

HI. this is a power supply issue. Your unit is equipped with an external power supply unit. This box incorporates all the necessary AC current regulators, and transfer agents to run the Wii. There are ,also, some protection circuits as well. These are in place to protect the unit from surges are unstable AC spikes as well. There is a fuse that is located inside the power supply box. Simple unplug the power supply, and gain access to the fuse, by removing the outer cover of the power supply unit. there are a few screws,(on the bottom), that hold the top cover. remove the screws, and open the power supply unit. this will expose the fuse. Kindly, inspect the fuse. if it shows signs of trauma, and it is blown, simply replace the fuse.

Now, if the fuse shows no signs of trauma, or burn marks, this will confirm power supply circuit failure. This will require that you replace this damaged power supply unit asap...