Not even an ADSL modem caught fire and that was hit by lightning so good that it partially melted. The power adapter was varm afterwards but not critically so

I thought about a similar problem when I bought a 4080 for my gaming rig. I was positive I got the power connector pushed all the way in. And I do leave my pc on when I’m not at home. I only shut down if I know I won’t be able to use it for a day or two. But your fears are legitimate.

Back when my homelab was a simple Pentium 1, I somehow had a PC Speaker melt down while I was out of the house.

Since then, it’s been a constant worry that something will catch fire while I’m not at home.

One of the reasons why I run monitoring, so I can check on the status of things.

The only stuff I have ever had catch fire in over 20 years if doing this were old crt’s and tv’s. So I just never used to leave those on when leaving the house. I have yet to experience an lcd failure. I have had power supply failures including Apple laptops but they just let the magic smoke out.

I’m sure everything I am currently running is safe, but I have that fear also, ever since one of the PSUs in one of my R320’s died and smoke started poring out the back (blown cap I think) - hasn’t happened since, but it’s one of the things I worry about

Whilst I am with the “yeah, that’s irrational” crowd, there are these things that might help allay some fears. https://www.controlfiresystems.com/products/fire-suppression/ceasefire-pre-engineered/

Install some smart fire/smoke detectors so they can notify you if something happens (it likely won’t)