Fitted Messiah and converted my Ps2 to a PSX!! Whoops!

[Del]

Hello All

I recently fitted a messiah in my PS2 and am now looking for advice / guidance.

I have a version 4 PS2 which I believe can be a little problematic as far as the after effects of fitting a messiah.

I have checked all connections made by fitting the messiah and PS1 games boot ok with no problems at all, just need to press reset twice as expected.

The only problem is the PS2 now doesn't like PS2 games be they on CDR or DVD, this does include my original games as well all I get is a black screen (better than the blue one with a PC though)

I think the Version 4 PS2 has a problem with the laser when a messiah is fitted, so I'm thinking I have to recalibrate the laser!?!

Any advice will be gratefully received.