Hi!

I have an old Korg NanoKontrol (not NanoKontrol 2 or studio - but the old old version) and it was running great with my pure data looper.  Then, all the sudden it stopped!  The light comes on for a second then goes off. It's not recognized by the system.   I can plug it into a PC and run the korg setup software and it all seems fine, but suddenly on my rasberry pi it won't stay powered. I tried a powered USB hub and different cablers so I know it's not that.   My full system is a rasberry pi 4 B with a Pisound sound card. I'm running purr-data on the patchbox linux distro...

Thanks everybody

@Tombot7 As it works elsewhere something has changed on the PI.
It's probably not PurrData if no updates have been done.
But check in task manager that there is not a hung Pd running in the background.
Does it appear in the Pd midisettings window at all?

Any other software drivers..... alsa etc. been updated?

Try a sudo reboot with the Nanocontrol plugged in, and if you have a backup card for the PI then try that.
Maybe see if a mouse works..... to check the usb interface.
Faults on a RPI are often caused by the main 5V supply slowly dying, but usually it won't boot when that supply is faulty.
David.

Did you check with dmesg in a terminal, you might see something related to power (looks like a power failure to me).

So I tried booting from an old image of the patchbox OS and it worked. I then swapped back to my current OS disk and booted ... and it worked!! However when I unplugged it and plugged it back in again it was up to its old trick for losing power after one second.

I’ll try the dmsg thing