PC enabled Secure Boot but is not showing any output.
PC enabled Secure Boot but is not showing any output.
I had to turn on Secure boot, since the Windows 11 Riot Vanguard Anti-Cheat system demands it for Valorant. After saving and exiting BIOS, my monitors remained dark once I restarted the PC. The screen would briefly activate, showing a "No signal" alert and a countdown of five seconds before powering off.
Details:
- Model: GIGABYTE B550M-K
- Processor: Ryzen 5 5600X
- RAM: 16GB
- Graphics: GTX 1660 TI
- Operating System: Windows 11
- Monitor: Samsung Odyssey G5 34" 165 Hz
I attempted various fixes including resetting CMOS, clearing residual power in the PSU, shorting CLR_CMOS pins, booting with minimal RAM, using another SSD, and even trying a lighter Windows 10 on a USB drive as a boot device. Still, no display appeared. I also tried updating the BIOS, but my motherboard lacks a flash function and I can’t access BIOS settings. It seems the monitor doesn’t detect any video output, causing it to shut down, and USB devices didn’t work either—my keyboard only lights up when the PC is powered on, indicating it still receives power.
Corsair 650 Watt 80 PLUS White Certified PSU, approximately 4-5 years old, paired with a 2019 CPU and motherboard. The GPU is from 2019, RAM is from 2019, and the motherboard is around 6 months old. Everything appears in perfect condition. The system functioned perfectly until yesterday when I turned on Secure Boot.
If Secure boot is turned off, does the monitor/display work again? Even if you can't play games like Valorant, the goal is to restore functionality so you can review settings and logs. I’m not sure what’s causing the issue—games, anti-cheat software, or something else might be involved. Full details are being shared here.
A helpful link could be useful: https://www.minitool.com/news/valorant-v...ws-11.html
I plan to shift this discussion to the PC Gaming section. A more relevant thread would help someone in the gaming community find a solution.
I can't turn off the setting since I can't reach the BIOS—it doesn't boot. When I observed something unusual, I powered down every other noise in the room and paid close attention to the computer. It appears that when it's running and the fans operate at normal speed, they seem to pause before restarting again after a slight slowdown.
Which fan or fan(s): CPU, GPU, PSU, or case?
Likely that the fans slow or stop because the system is not really doing anything and there is little or no need for cooling.
Do you have access to a known working PSU (650 watts or more) that can be swapped in? Remember to use only the cables that come with the swapped in PSU.
I own a functional 450 watt power supply, but it seems to be operating at less than 400 watts recently.
Edit
It also functions identically with another power supply unit.
Wattage matters, but the PSU's capacity to adapt to power changes is equally crucial.
Especially during sudden spikes; the PSU might supply the required wattage but not quickly enough.
A PSU from 4 to 5 years old is likely at or near its end of life—especially with frequent heavy gaming or video editing.
Also note that PSUs deliver three voltage levels (3.3, 5, and 12) for different parts of the system. A failure in one rail can cause issues while other components appear functional.
Another risk is thermal shutdown. Has the thermal paste been re-applied?
Try another PSU; switching to 400 watts could be sufficient for a quick test to see if the system can restart.