There are different instructions for booting copied ea ps2 games. These instructions are as follows (taken from www.pmcmodchips.com):

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PS2 EA Sports Games and other that wont boot - Hold reset until AR2/GS2 menu and disc slows right down - let go - swap disc (you have 4 seconds).

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Give that a try and you should find that the games should now work OK.

l8er,

4nim4l.