But now my player always thinks it is on DC power. The switch in the power jack is ok.

Is it possible that you have Hijack's "Force AC/DC Power Mode" setting set to DC?

From the Hijack FAQ:

Force AC/DC Power Mode
Allows you to force the player into thinking it's on either AC/Home or DC/Car power when it isn't, and shows what the current mode is. This is useful if you have the hardware failure where the empeg thinks the AC plug is always plugged in, and therefore will always boot in AC/Home mode (see this FAQ entry). Also useful for testing purposes.

Options are Normal, Force AC/Home, and Force DC/Car.


If your adaptor socket is indeed not the issue, my guess is that you have this setting set to "Force DC/Car." If that's the case, switch it to Normal and see if that fixes your problem.