Roon Nucleus+ Rev B has stopped working

Roon Core Machine

I have had a Roon nucleus+ Rev B (SN 54B2030BBF24)

Networking Gear & Setup Details

Have BT home hub connected to wired network
Netgear Prosafe 48 port switch
Cat 6/7 cabling

Connected Audio Devices

Naim NDX2 + others - wired

Number of Tracks in Library

4tb music in FLAC format on internal WD RED solid state drive drive

Description of Issue

Unit has worked flawlessly for around 4-5 years and it has worked flawlessly. A few days ago it no longer listed the local music in the system (although the flac files were visible on the 4tb internal storage drive when viewed remotely from a pc on the network). The unit had the latest version of the software. The unit was then powered down for several days as we were going to be away. On our return I attempted to power up the unit but it is no longer visible in roon remote and i cannot connect if i attempt to connect to its fixed ip address from a web browser.

When i attempt to power up

  • the network cable connectors light (orange and flashing green)
  • the power button does not light up
  • if bottom cover is removed a small green led is visible near the power connector (this is the only internal light visible)

What I have checked so far

  • Checked power output of transformer which is showing just over 19v
  • Checked connections and seating of M2 drive
  • Checked connection of SSD storage drive
  • Tried different network ports (both directly on router and through network)
  • Checked on Router that there is not a conflict on the fixed IP address (the Nucleus is visible as connected - MAC address is correct at the fixed ip address)
  • tried to connect hdmi cable to monitor but no visible output