Ahh FF8 is difficult, I could only get it running under ePSXe believe it or not.
In that case it's probably something to do with your sound plugin, not your game.
Also there is an awesome windows program for ripping PSX games to isos, it is called isoproducer, you can get it off megagames. It's slower then other programs and only runs in windows to my knowledge but it works.
I'm sure you have to patch it if you rip it (due to the protection on it), that is why you got the black screen, see here for more info.
I have a question though, does running ePSXe under Linux still take up all of your processor resources?