i have just installed a matrix infinity chip in a v4 ps2. the problem i that it will not boot any dvdbackups of movies or games , but it will however boot originals and cd backups. i get a disk read error every time. i have checked the solder points and to make sure i dont have any bad points and ended up basically reinstalling it. i have also cleaned the laser as well as adjusting the white cog at the back with no success. can anyone help?