Question When PC is turned on RED CPU light flashes on for a few milliseconds then shuts down entirely. Can't seem to fix. HALP!

Feb 9, 2021
I am using the following parts

AMD RYZEN 5 3600 6-Core 3.6 GHz (4.2 GHz Max Boost) Socket AM4 65W 100-100000031BOX Desktop Processor Ryzen 5 3600&cm_re=AMD_Ryzen 5 3600-_-19-113-569-_-Product&quicklink=true

MSI B450 TOMAHAWK MAX AM4 AMD B450 SATA 6Gb/s ATX AMD Motherboard b450 tomahawk max atx am4 motherboard&cm_re=msi_b450 tomahawk max atx am4 motherboard-_-13-144-267-_-Product&quicklink=true

CORSAIR VS Series VS600 600W 80 PLUS Certified Non-Modular ATX Power Supply, CP-9020224-NA supply&cm_re=power_supply-_-17-139-266-_-Product

MSI GeForce GT 1030 DirectX 12 GT 1030 2GD4 LP OC 2GB 64-Bit DDR4 PCI Express 3.0 x16 (Uses x4) HDCP Ready Low Profile Video Card card ddr4&cm_re=graphics_card ddr4-_-14-137-318-_-Product&quicklink=true

Lenovo ram ddr4 8GB desktop Gaming memory 2666MHz Interface Type 288pin 1.2V memoria rams ddr 4 for PC ddr4&cm_re=RAM_ddr4-_-9SIATTBDDE3695-_-Product

When turning on pc cpu light flashes for a millisecond and everything shuts down, I double-checked the connection to the power supply and that the reset and on switch has been wired properly.


One of the common causes of short circuits in a brand new assembly is that one or more case stand-offs is in the wrong position, OR that none ever were used at all. See my post of Dec 12/20 in this thread

It was written for someone who planned to move his system to a new case, but it applies to your situation as you mounted everything in a new case. If you have any reason to suspect the stand-off location is involved, I suggest you unscrew all the screws (often nine) that hold the mobo in the case, and remove it carefully. Then study closely whether every one of the stand-offs is exactly where a mobo mounting hole is.