Fortunately I also have a (working) STe, so I borrowed and replaced all 4 SIMMs from it but it made no difference.
However, for some reason I came to physically press down on the U502 chip (GST shifter) and for a brief second saw the screen flash with the TOS desktop showing, so after removing it from its PLCC socket, carefully bending those socket-pins out and putting the chip back in it now appears to work OK again! Yet another "stupid" hardware error. Frustrating problems but inexpensive to repair
Oh well, at least I got to clean the SIMM contacts with IPA. Apparently something that was needing judging by the residue left on the Q-tips
Black screen (but sync?) on Mega STe
Re: Black screen (but sync?) on Mega STe
STe | MonSTer with dual IDE-CF memory card adapter | NEC Multisync 1990SXi | ST_ESSC | RSVE | Link '97 | Sony HD floppy drive/AJAX controller | Exxos HD floppy module | Battery-backed Ricoh realtime clock module | Discovery cartridge | C-Lab Unitor-2 | C-Lab Export | C-Lab Combiner | C-Lab Steady Eye | C-Lab Human Touch | Unicorn USB
Are you a good person?
Are you a good person?