My 10-year old TL-SG2424 has just keeled over. The bank of green LEDs on the left are still flashing, for those ports which have a cable connected, but all of the ports seem to be dead - none of the ports have an LED lit above them, and the connected devices are not detected on the LAN.

I've tried power cycling and a factory reset (using the pinhole), but neither have helped.

Any ideas?