My PS2 picture jumps around with lines and squares.

wiggle your audio video cable....its probably bad

X - JUMP
Triangle - fly
O - Accelerate
Square - decelerate/land

This should all be in the user manual provided with the game.

Sounds like your control is bad.

its nothing it goes on the inside on the left side its just there so you can buy a stand to stand your ps2 up

On the bottom of the PS2 thre are roughly 6 out-of-place squares. Pry these off. Underneath are the screws.

Once you have the screws off, start prying carefully around the edges of the top half. The keyword is "carefully". There are a multitude of clasps that hold the top case to the console. There are also wires running to the buttons above the disk drive. You must absolutely careful not to snap or nick them, or else you'll be buying another PS2.

In the game, press bark (square), bark (square), bark (square), growl (hold square), growl (hold square), growl (hold square), fart (left, right, down). = Enables Cheat Menu

as for a guide try this one

http://www.gamefaqs.com/console/ps2/file/917852/27954

Info taken from www.Gamefaqs.com

cheak the tv wheather it is working properly
check the playstation settings

make sure that the av cable is all the way in and tight or if its like being moved when u are playin with it cause the av cable may like shake and may cause flickering

i brought a ps2 noty the slim line but the other one powers on yet a cant get a picture ive tried 3 tvs and i get the same problem..?