If a game blackscreens, it is probably due to an outdated or missing IOS. Same for the channels. There is a list of which IOS games use. You can install the IOS you need with a wad manager.
An alternative solution, but also a riskier solution, would be to use system menu X. It allows you to update, while retaining all of your hacks. Updating should fix the blackscreens. Be warned: this is an advanced modification! http://www.wiihacks.com/recommended-...ard-brick.html