I have got two (2) Juniper routers J4350 that are out of order :

• All the interfaces are down (leds on the interfaces don't ligthen, ping dosen't respond)
• No output on the console port (even when booting)
• I've tried to reset the router (holding the RESET CONFIG button on the front panel during 15 seconds) and nothing happened, even while booting the device
• I've opened the router to check the fans. I've removed some dust and nothing has changed.

I wanted to precise that the leds on the front panel are all on:

• The POWER led is green
• The STATUS led is red
• The ALARM led is on and is orange
• The HA (High Availablity) is on and orange as well

I have found nothing on the Internet to solve this problem... Thank you for helping me :)