I have an old system, with Intel Pentium Dual Core at 2.2GHz, Big Ant ATX-S350, 2GB of DDR2 Kingston RAM at 800MHz, and an old Nvidia 64mb graphics card I am unsure of the model. It was working when I tried it on Windows 10, but booting to Windows XP or Windows 7, it fails.
I have the OS' on different HDD's, and it starts with 5 long, high beeps and then is lots of really fast, low beeps, then repeats twice. The processor I migrated over from an old system running XP. The beep codes show as CPU thermal tripping, even though I just installed a new heatsink.