Thanks. I tried to unplug, press for 60 seconds power, press for 30 seconds power, reset plug, retry, no. Then if I reset via the hole in the back, power on while I keep another key pressed with power on, it boots. I press power on, and press another key with it. Then release power on and keep another key pressed. This way it boots. But if I stop pressing the second key the PC sounds like a little click and powers off instantly. The problem is very strange. The same on 2 pc. To reboot I must reset with the little hole in the back and then again it boots only if i keep a key pressed. If I don't it lights the led for 2 seconds, turns off the led, lights again the led for one second and then die. Only after the reset via the little hole I can reboot, but only if I keep a second key pressed. But if I release the key it shuts down instantly!!! This is the same on 2 PC. Both Medion E4251. I have other 5 E4251 and they work. I change Power Supplies between them but it does not change anything. Power supplies are not defective for sure.
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