[Solved] My new ST2320L crashes connected Amigas?!

[Zac67]

Possibly too much load on the sync lines, so the Amigas try to sync to a non-existant genlock.

[Zac67]

Pin 9 is either key or +5V from graphics. If it's even connected through the adapter an EMI is limiting the current to ~100 mA - don't think too high a load is any problem (unless the PSU is critical already).

[Zac67]

@Kremlar

EDID is the data structure, the signal/pin is called Display Data Channel (DDC) and sits on pin 12. The monitor DDC circuitry may however require +5V present on pin 9 to work while not being powered up; some monitors may even require pin 9 power while they're running.