led when not powered on

I have a Gigabyte B550 AORUS Elite AX V2 Rev 1.5 Motherboard with a AMD Ryzen 5 5600X processor and a Gigabyte Geforce GT 1030 video card. The computer is plugged into a power strip. When I turn on the power strip a flash of white light streaks through the LED’s on the motherboard (about half a...