I have home assistant installed on an old PC and forgot what it’s original specs were. how do I find out such things as motherboard, CPU and RAM (I can find ram size, I wanted to look at speeds)
When you switch it on, does it give you the option to enter BIOS setup? Press F2 《delete》or F12?
You should find all you need there.
You can safely exit without changing anything.
F1 on Lenovos and F10 on HP.
Try to hold down a key, like space while booting. It might trigger a hanging key error and show the option to enter the BIOS
Alternatively you can try to find it in the HAOS settings.
There should be one called hardware and there it should have an option to show all hardware (maybe in the 3 dots menu).
Morherboard make and model is hard to find this way though, because it shows hardware parts and a motherboard consist of multiple such ones. There is rarely a motherboard entry somewhere to extract.
no keyboard or monitor attached, stuffed in a closet where it is not easy to hook up such things
If you are running Home Assistant OS, install the advanced terminal app (formerly add-on) and run these commands in the shell:
apk add pciutils
apk add inxi
inxi -F
That should give you plenty of information.