Can you switch the Wii on using the Power button on the Wii remote? That's from Red to Green LED, I don't expect you to get it synced.
Neogamma didn't cause your brick, any banner issues with the channel would have been seen as soon as you rebooted, even a soft boot would show this.
A black screen Wii is generally only caused by System corruption or bluetooth module/wifi module failure.
Look at http://www.wiihacks.com/bricked-wii-...creen-wii.html