Hi Dominik

Also posted in your other thread

That indicates there is a problem in the DT-50's front end DSP/Pre-amp section where some digital modelling takes place. The effects return socket simply feeds the amp's analogue power amp section.

The problem you have may possibly be hardware related, but probably not. A possible indicator of this would be if you don't hear the amp's relays clicking within about thirty seconds of turning the amp's main power switch on. Clicking would indicate that things are probably working correctly in terms of most of the hardware, but no clicking would indicate a definite problem to me and the amp may need to be sent in for service.

However, far more likely in my opinion is the possibility that the amp's flash memory (firmware) has been upset by something such as a power surge (like a computer might be affected in a similar way). You should therefore, try to re-flash your amp's firmware before becoming too alarmed. You'll need a decent and reliable MIDI interface to achieve this as well as the latest version of Line 6 Monkey (1.41) on your computer. Ensure you connect both MIDI In and MIDI Out correctly. The process takes about ten minutes to complete, but may take a little longer. Do not disconnect your MIDI cables until Monkey advises you that the process has completed.

If a power spike/surge has caused the issue and corrupted the amp's firmware installation, it might be time to think of getting a power conditioner to prevent this happening in the future.

If this doesn't work, depending on where you are, either contact your dealer to arrange for service or contact your nearest Line 6 Authorised Service Centre to arrange for the amp to be assessed and/or repaired under warranty (it cannot be 12 months old yet, but may be in a month or so!)

Nick