Kernel Panic HTPC won't boot, where to start?

  • Hard to comment on what the issue is from that info. I'd suggest approaching it as an upgrade opportunity: start with a new installer USB but interrupt boot and type "run" instead of allowing to default to install (and running the installer). This should give you a working LE install on the USB, from where you can a) prove the current release boots/runs okay on the hardware, b) copy/backup any essential config you want from the original installation, c) figure out what update or reinstall path is appropriate.