Как вы себе представляете такой ПК без корпуса?
Да никак не представляю; меня просто озадачил тезис:
Компьютер определяется _только_ по мамке и с ОЕМ копией можно менять что угодно кроме нее.
Внятного подтверждения сему тезису я нигде не нашёл...
https://oem.microsoft.com/script/con...?PageID=552862
An upgrade of the motherboard is considered to result in a "new personal computer" to which Microsoft OEM operating system software cannot be transferred from another computer. If the motherboard is upgraded or replaced, for reasons other than a defect, then a new computer has been created and the license of new operating system software is required.
If the motherboard is replaced because it is defective, you do not need to acquire a new operating system license for the PC. The replacement motherboard must be the same make/model or the same manufacturer’s replacement/equivalent, as defined by that manufacturer’s warranty.
Достаточно внятно?