Kingdom Hearts won't recognize controller?

i got my friend's old ps3 a week ago, and just needed to get a controller and av output. i also bought KH 1. i get home, fix the YLOD (he got tired of fixing it a lot, so gave it for free), and go to play KH, but it says that the dualshock 2 controller isnt plugged in to port 1. well, i go to the store and get a dualshock 3, and buy an adapter online. the controller works fine, but i still get the same message about it not plugged in. will it only work on a ps2, or is there some sort of fix?oh, ive tried plugging the adapter into the far left and far right ps3 ports, and the controller into both ends, but got zilch. gonna double check the controller works w/ other games using little big planet 2 (it was stuck in the ps3, friend said i could also have LBP2)Also, as i was searching i found something that said about making sure the red light below analogue was turned on. tried it, still doesnt work

dualshock 3 is a PS3 controller, its USB or wireless, no need for an adaptor.

Replying to #2

crap, typo there, sry. i got a dualshock *2* controller and adapter, but no luck w/ KH

FUCK YEAH!!! after visiting the store 3 times now and asking someone on the ps forums, i finally got kingdom hearts to play!! im a tad excited right now