Thanks, didn't realise there was those settings in there...
tried the settings to access the game/disc in wiiflow, one game tried loading - (loading bar came up) then went to black screen with error message saying disc could not be read, another game just came up with an error message after inactivity (saying disc open failed), will try with some more... The thing I don't understand is that at some point in the past all these games used to work, so unsure of how it could have been due to a bad rip... I still have the original iso's so could always try burning again (although not sure if that's futile), will carry on trying some more games meanwhile...
*EDIT - tried another game, similar problem to what used to happen before doing the softmod (game loaded up, got through intro/main menu and then screen goes black and says: "The disc could not be read. Refer to the Wii Operations Manual for details") - as if the Wii Operations Manual is gonna help me!?