Reason: It's not that merchants cheat you or buy parallel imports, but that it is possible to assemble parts. Because the goods of the merchants are sometimes placed in the warehouse for half a month or even a few months, the memory electronics of the motherboard are dead and the BIOS is gone. So when you turn on the computer, you will be prompted to rewrite the BIOS. Please insert the USB flash drive. Since I can't get into the BIOS now and it's a new machine, I can only insert BIOS floppy disk to rewrite it, write DOS commands or mostly take out the BIOS of the motherboard and rewrite it directly. These all need professionals, and ordinary computer shops can only read USB or write CDs.