First of all, do these problematic games work fine when run off their original media?
Originally Posted by sam4games
Secondly, if your games are imports, can your TV work with the game's video mode? (Supports BOTH PAL and NTSC video standards)
Lastly, please use Verbatim DVD-R discs that were manufactured by either Taiyo Yuden or Mitsubishi if you haven't been doing so. Cheap discs will wear out your later sooner and may result in gameplay issues.
Unmodified SCPH-77006 with SM 3.6
SCPH-39006 with M-chip modchip, SCPH-10281 NA and refurb Seagate 80GB HDD
SCPH-10000 v1.00 with SCPH-10190 PCMCIA NA and SCPH-20400 HDD unit