Kobiv11

I need help with my pc. It works perfectly fine but when I try to start Fortnite/CsGo the pc reboots. Any help? Monitor: Asus VG248 144hz Specs of pc: Ryzen7 2700x Radeon 5700xt MSI B450 Tomahawk 16gb Corsair Vengeance Pro Rgb CoolerMaster Hyper 212 Rgb Black Edition Corsair CX750w PSU Adata SU800 256gb SSD Seagate Barracuda 1TB Windows 10 x64 bit Case: Thermaltake lvl 20 mt Any ideas on why it would be rebooting? Thanks