All my inputs are dead :(

Hi all!
yesterday while I was playing my sweet KPA (lunchbox green, no PA on board, bought from Davide - guitarnet70 here on the forum), the KPA emitted through the speaker a medium high pitched whistle (and no more sound from the guitar).
I had to reboot the unit and after that every input on the KPA does not work, and DSP error was lit in the top right of the display. If I pressed the key over dsp error, the KPA says "snapshot saved", so I guess it's only a notification.

The tuner (and all of the KPA) does not receive any input (front, alternative, return input)...and of course I have no output, too. Things I tried:

1) booting with system pressed on
2) updating firmware to latest (DSP error it's not showed anymore)
3) front and alternative input with different cables and guitars
4) resetting midi pedal values
5) checking spdif option and set / unset that

I did a search on the forum so I checked the most common stuff (yes, my input cable is in the right hole, unfortunately , tried profiler mode, spdif, manually setting midi volume pedal value )
I hope to be wrong, if there are other tests I can try to restore my inputs please let me know, but I think my KPA needs tech assistance

PS I sent an email to the support team few minutes ago.

Received a reply from the support, tried clearing the rig buffer and rebuilding internal database, but still no input/output working.

Forgot to say......the input led and the master led always stayed since the problem arised (and still are) solid green, without a single variation in brightness, and both stay brightly lit even with the guitar cable disconnected.

I guess my KPA needs to be serviced, and of course we are just in the middle of a studio recording....well I guess that will need to wait

Quote from tylerhb

Did you try disconnecting the power cable for about 15 minutes? Sometimes this helps... But your problem sounds serious...

Yes, it stayed without power cable for few hours while I was taking the KPA back from the studio, and also today while I was doing some tests I had to disconnect the KPA from the mains for about 1 hour......unfortunately it didn't help

Quote from DonPetersen

Hi. I guess it's best to stay in contact with support.
Have you told them the rebuilding etc. didn't work?

Hi....thanks for the input. Yes, I did the procedure Burkhard (the support guy) told me to do and then replied back. Now waiting for instructions from him...

Eeeehhhh......si, capita

I hope it can be solved without shipping the unit, but seriously doubt that

[OT] Gianfranco your paypal link doesn't work![/OT]

Burkhard replied few minutes ago it could be something with the CPU-board, so it needs to be serviced
Already opened a ticket with the suggested kemper service center http://www.synthesizerservice.de

PS Thanks nightlight....I hope it will take days and not weeks , I know they have other stuff to do other than my unit, but as a tech myself I also know the total repair time will be 1 to 2 hour at the most...assuming their service centre have readily available common kemper spare parts

Just a little update......the kemper arrived yesterday at the service centre. Hope it will be back soon and in great shape!

The final update.......Kemper is back (arrived fast and safe about 2 weeks ago, the service centre was really fast, much faster than me updating this 3d !) and is in perfect shape now!