Try using a PC PSX emu like ePSXe to test the ripped ISO's before you convert them. You'll find that ripping PSX games does not always make a perfect ISO like ripping a normal CD would. I have no idea why, but I haven't been able to get ANY of my PSX games to rip correctly. Not really a big deal since I only have six games and it's easy to find torrents for them.
I used ePSXe about six months ago to play some games, as far as I know it's the best PSX emu out there, and believe me, I tried a bunch of them.
Test that ISO
