A red light is on in the core switch

A red light on your motherboard usually means a hardware component isn't working properly — but it doesn't necessarily mean your motherboard is dead. Start with the basics: check power connections, reseat RAM, GPU, and CPU, and clear the CMOS. You decide to investigate the cause and troubleshoot your PC — check power cables and PSU switch, then take off the side panel and it's here you're greeted by a glaring red CPU light on your motherboard. While a red CPU light can indicate some serious hardware problems, in. Starting with the most common, red light for CPU. These diagnostic LEDs are actually helpful tools designed to pinpoint.