Ps1 copy works but not ps2

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I made a back up of tons and tons of ps2 games but cant seem to get any to work. I also made a copy of Tony Hawk 2 for ps1 and it worked fine. I tried Crash Bandicoot Racers or something like that for ps1 and it didnt work either. I have the external usb key (neo key). And ideas as to what the problem? Could I be copying them wrong? Is the soldering right or wrong? Thanks for any help!!!

Very Frustated Gamer!
Josh