you can try the biro trick..take out actual pen bit, melt it, stab in the hole with the screw, hold for 5-10 secs, cool it with very cold water
i manged to open 2 gamecubes this way, but had to redo the biro for every screw. Once i had the scews out i cut small slots in the heads for a normal flatty screw driver.
I looked up "gormless" in the dictionary, it said "without gorm" .... so i looked up "gorm" but it wasn't there ????
