[SOLVED] Electrical interference visible on screen

[Gravedigger]

Hello, I have electrical interference visible on the screen as soon as I turn on my MIDI interfaces.

I have an X68000 with a Midori 10Mbyte RAM MIDI card.

3 MIDI interfaces:
- Yamaha MU2000
- CM-64
- SC-88 Pro

Apart from the CM-64, which has a built-in power supply, the other MIDI interfaces no longer have their original power supplies. So I bought PSUs on Amazon for those two.

Everything is connected to a VGA switch, connected to an Ossc, which is itself connected to a Scart to HDMI cable to make the frequencies compatible with my screen: a Predator Z271T.

I notice that as soon as I remove the MIDI cable from the X68000, the interference disappears.

Now I don't know if the problem is with the MIDI cables, the Midori card, the MIDI interfaces, the PSUs, etc.

[Gravedigger]

In the end, the culprits were the two Amazon PSUs. I tried others and I no longer have any problems...