Not sure this will solve your problem but you can try it. Reinstall IOS70. Now reinstall your system menu. This will wipe priiloader off. Now start your Wii. Can you now get the system menu to come up? If so, try to install the latest stable version of priiloder. I think it's .3r48? After you intstall it, set it to use system menu IOS and disable all hacks for now. Now try to exit to system menu (this is just so you don't have to keep rebooting). If the system menu starts, your good to go. Now go back into priiloader and adjust your settings to your liking. If priiloader fails, now you know it's one of your settings.