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Ich glaube du meintest diesen Post:
Here's what usually solves this for me:
1. Unplug absolutely everything from the system (power, ethernet, USB ports, HDMI, the works)
2. Press + hold the power button for 5 seconds or so (this is to bleed any active capacitors inside the system)
3. Reconnect ONLY the power cord
4. Press + HOLD the power button. This one takes longer, 30 sec or so. If all goes well, you should get the blue light followed by the white light.
NOTE: If it goes off immediately, let go of power and press+hold it again.
5. Once you have the white light, reconnect everything else
The system should be in recovery mode, and from there you can do a regular restart and it should be OK.