Issues with MSI B660M-B debug lights and system functionality
Issues with MSI B660M-B debug lights and system functionality
Hello everyone, I completed assembling the new PC and the monitor failed to power on. I looked at the debug indicators and saw a yellow signal on the DRAM. Each time the system launches it displays a red CPU light. After many hours of troubleshooting and fixes, the yellow indicator ceased and a white VGA light appeared. When the computer starts, it shows red, then yellow, followed by white, but that white is off too, yet the PC remains inactive. I attempted a CMOS reset, tried various RAM configurations, and verified everything on my main machine except the CPU and motherboard since I can't access them. The motherboard lacks a flash BIOS button, preventing me from accessing net BIOS. Any suggestions would be appreciated.
Ensure the RAM is properly seated first. Verify everything is aligned correctly. These boards feature single-sided toggle slots, requiring careful insertion. Follow the manual for guidance. The setup instructions are somewhat unusual. If the yellow light persists, it may indicate faulty RAM. Since the device operates on a single slot, test each one individually to identify a compatible option.
The yellow glow after many hours stopped working. Now each time I turn on the PC, it shows red, then yellow, then white, and then nothing except the screen stays dark. I’ve inspected all components on another machine and everything seems okay.
Check if it’s powered on and all connectors are properly placed. Identify the graphics card you’re using and confirm the monitor is connected correctly—ensure it’s set to the right input and plugged in at the proper location. If the monitor isn’t syncing, locate the physical power switch, turn it off, restart the device, then turn it back on once. Once that’s done, leaving it on with all devices connected will cause it to shut down automatically when no signal remains.