Diagnose PC issues where it won't start and the motherboard light is blinking.
Diagnose PC issues where it won't start and the motherboard light is blinking.
The front red light indicates the CPU, the third is VGA and the last one is boot. We've already checked re-seating the M.2 slot, CPU and cables, re-seated RAM, and possibly the GPU. Specs include 5800x, MSI Mag B550 Tomahawk with WiFi, 6950XT, 16GB Corsair Vengeance 3600MHz, MSI Mag Core Liquid P240 AIO, SNAP-ERO 1TB, MSI MPG A850G. Updated November 27, 2022 by ansh194537865
Determining if it's a brand-new build or a previously functional system involves checking for signs of recent repairs, missing components, or unresolved issues.
Have you verified the BIOS version matches the Ryzen 5000 compatibility? It’s unlikely a recent B550 board lacks such support, but it’s possible you have an older model. Would checking the CMOS reset help?
The bios flashback feature allows updating the BIOS without requiring a compatible CPU. CMOS reset is achieved by connecting the CMOS pins on the motherboard in a short circuit. Refer to your manual for specific instructions related to your motherboard, locate the CMOS Reset setting.
Start with a CMOS reset attempt. If unsuccessful, proceed to update the BIOS. We're working through possible causes one by one. If neither of those applies, it might be easier for others to find a solution. Unless you'd like me to immediately conclude that the motherboard or CPU/GPU/SSD is faulty.
I performed this action, but it keeps repeating the same process. The CPU indicator lit up for about five seconds, then switched to VGA and stayed lit for five seconds before staying on during startup. I kept the screwdriver on the two pins for roughly twenty seconds.