If you have a voltmeter, you can measure the test points on the back of the PCB to see if all the rails are ok. The silkscreen says what the expected voltages are.
I have that same case and use it for testing, so it shouldn’t be a compatibility issue with the PSU, but… something else… That Doepfer PSU has an issue where the +12V and -12V power rails come up with a time delay, but that time delay flips on a warm-boot vs cold-boot (+12V is first when cold, -12V is first when hot).
So you can try powering on (check that crow isn’t working), then quickly flick the power switch off then back on. If this does help, let me know and we’ll see if we can debug the issue to avoid this annoying workaround.