Burning Iso. Backups
 

Well i went and made some iso backups of some of my older games that were highly scratched up but still playable so i burn it with alcohol 120% using the playstation setting so i go and try it out and it takes me to the playstation cd-player thing, i know the iso works because i dled an emulator in a fit of self checking, I have the old PAL playstation btw...

Maybe your modchip has gone missing.

Just because it loads on a emulator doesnt meat it will load in the PSX. Make sure read errors are set to abort on the software.