Learned some new trick with these brands: Ctrl-Alt-S will show you system information such as Product model, system BIOS version, and many more.
I've received the error message a couple of times now about the 90D-System Temperature Message at boot time since I set it to boot up automatically in the morning at 6AM to run the Printer/Copier meter reading server.
Looked it up, looks like a common issue, that the error maybe shown in error. All that's needed is just to do a BIOS upgrade (from 2.02 to 2.07 in my case).