There are no coincidences with lightning, it takes whichever route possible, and can take multiple.I used a fiber hdmi cable. I had to use fiber because it was a long run inside the wall. Only the power and one hdmi was plugged into the projector.
I'm still puzzled at how this happened. To many things are acting up for it to be a coincidence.
Any wire/lead/route that is capable of leading electricity, copper, aluminium, you know, wires, be it AC, LAN, HDMI, coax, telephone, ADSL, alarm, doorbell (yes), anything, really.
If there is a way, lightning will find it.
In my system, I debated quite some time if I should hook it up to my LAN network or not, I decided not to, simply due to the increased risk.
Instead I chose to 'isolate' my system by plugging/unplugging an SSD to fill/replace content as desired, small sacrifice of convenience, but saves a lot of headache and money.
Wi-Fi is better than wired in that sense, and the less equipment that is wired together in a LAN network, the better, I never wire a unit that REALLY doesn't need it.
I have neighbors not unplugging, hearing them say they got their **** blown out, really can't understand them, the fireballs wandering the power lines can't be smaller over there.
I have mad respect for thunderstorms, not afraid, but respect, also value my equipment to a sense I could never forget to unplug, I hope the idea here is spreading.
If you can get your stuff working again, you're in mad luck.