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Ensure that you are using the correct AC adapter
You should always use the supplied AC adapter. It should have an output of 12V, DC and 2A. This should be written on your AC adapter.
Ensure the AC adapter is correctly plugged in
1.
Make sure that the AC adapter is connected to the PSU socket on the back side of your DacMagic 100.
2.
Make sure that the AC adapter is fully inserted into the wall socket and that it is switched on.