My Gameshark does not load!!!!!!!!!!

[maradona2164]

I just installed a USB modchip into my playstation2 and original games work as well as my momory cards, however my gameshark does not load. Everytime i put my gameshark it takes me into the brows screen and then it reads the disk and it says eror reading disk. I have tried 3 different game sharks, but they all do the same thing. i don't know if i made a mistake when i installed the chip. My playstation2 ia a US version 4.

Please help me out and thanks in advance!!!!!!!!!!