I have a 4 in 1 PSX CD game, when boots up on the PSOne, it shows a menu and you can choose which game to play with....
but when i put it on my messiahed ps2, it doesnt work, doesnt even boots up the PS1 logo, i wonder if there is a way to rip out the games from the CD so i can just burn them on 4 separate CDs so it would work on my ps2 since i have already sold my old psone
can anyone help?

check to see if the games are in individual folders via your pc...that should be a start

the files are everywhere, it has a .exe file, which i think is for the menu, and there are 4 Slus_XXX.XX files

check to see what kind of program burner you using? If you use PSXcopy, then it don't work on PS2. Use other burning software