cpu missing

Hello, I build a PC for my dad only for Internet Surfing Stuff, the components are: AMD Ryzen 5 5500 6x 3.60GHz So.AM4 BOX Gigabyte PCIe GC-WB1733D-I WLAN AC 512GB Patriot P300 M.2 2280 PCIe 3.0 x4 3D-NAND TLC (P300P512GM28) 400 Watt be quiet! Pure Power 11 Non-Modular 80+ Gold 8GB...