WD DL2100 does Not start

My WD DL2100 does not start anymore. When I plug in the power supply,the light flash for a very short time, but the WD does not start. After pressing the power Button several time, the red LEDs and the Green Network led are solid on. Can you help me, please.
Best regards,

Hi @Morchel,

Please refer below link to check device is detected or not:

Please refer below link to check more information about LED status: