2 disc game..

[snake2]

try this:

put in a real game (any game)
it will start to spin slowly at first then faster
when it gos faster take out the real game and put in the back up game this is how i play my 2 disc backup because i dont have a chip

you will need to find something to hold down the lid senser,
for the small psone use a twist tie the switch is next to the open button for the big psx use tape the switch is in the back

hope this helps