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Messiah PS2 V4 doesnt boot Ps2 DVD-R games
You may have blown a fuse on the motherboard somewhere...? If so, it can easily be repaired.
One thing I have noticed is that the laser azimuth adjustment will sometimes allow some media to boot but not others. I have worked on a couple of machines where the azimuth adjustment is required even when brand new. DVDr is the hardest to read so if your azimuth adjustment was "on the hairy edge", it may have just now gotten to a point where it will no longer read DVDr, yet everything else seems to work fine. Sony obviously does not care where this adjustment lands, as long as it reads original CD and DVD so your azimuth adjustment may have been close to the limit from day one.