Hyped nc400 switching off after 1second

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Hello,
I have 2 nc400 setup in dual mono. The left one is working perfectly but not the right one. At power up, the right one switch on for 1 second then switch off (no more light and I can hear a click).
I have unplug all connectors but I just kept the power connector comming from the alim module. I even left it completely unplug for over an hour and it still behave the same : switch on then quickly off and stays off.
Is there some kind of hard reset I can try?
Thanks in advance for ur help.
 
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