Which steps should I take to ensure that this is something not related to the Super SD System 3?
Details of my PC Engine are:
PCEngine model: Core Grafx
Power Supply: 3rd Party.
Video cable: Retrogamingcables' Sega Mega Drive 2 / Genesis 2 RAD2X cable
SD card brand: Kingston
Region modded?: No, but other mods were made (7374 RGB amp - mickcris amp; jailbars fix)
SSDS3 revision 1, 2 or B?: B.
In Game Trigger enabled in the Options menu? No.
Any other details specific to your setup: LCD Display.
Thanks for any help you can provide.