Help with dead Version 5 U.S.

[NoNewTaxes!]

I Recently installed a ModChip.___ chip in my PS2 (yeah...I know now).After installation,I booted a PSX backup,and it loaded fine, but I did not play...just testing.Then I booted a non-DVD PS2 backup...it worked up until "loading" the game for play.Then my machine froze up and no longer sees any discs at all!The laser is not dirty,and I have not made any adjustments/calibrations to it.I would appreciate any comments/suggestions that may help.Thank you!