M4300-12X12F no response

Hi all,

I have four M4300 which I configured for stacking, all VLANs, IPs etc. Saved config, powered off and then took into the server room, screwed into the racks and powerd up one by one. One of the M4300 did not came up so I did pull the power cord and pluged in again, but no response. The Power LED is orange, the fan LED green, PSU LED green and quite strange the OOB port LED is green like 1G activity but there is nothing attached and there is nothing inside the port.

I switched the PSU with another M4300 - nothing

USB Console cable attached but no CLI output

Pressed the reset button on the front side for more then 20 seconds - nothing

What else can I do?