No signal to tv from wii
I hope that what I am pretty sure is wrong (hardware failure)is not your problem.
1) Try hooking it up to another TV
2)Check physical connections: cables, and inputs on both TV, and wii. Lose and dirty connections are usually the problem.
3) You stated you unpluged everything. Did you wait ten minutes before plugging bower back in? Be sure output is what it is suppose to be using multi-meter.
4)Nintendo has software(code) embedded so that pirated software is always detected and blue screens the unit. There are geeks that have "workarounds" with SD cards, but I have found OEM games used in pawn shops for as little as $5 most for no more than $ 20. My point is if you used a copied game Unit is fried. I am on my 3rd wii, the 1st one when they first came out lasted 3yrs but had a ton of hrs, on it. The second I bought used for $100 at a pawn shop lasted almost 2 years, and the current one, used is almost 2yrs. old. paid $160 but got about 10 games and wireless controllers, new cables.
I hope your problem is just a connection or power adapter.