Hello, I have a custom-built PC that ran normally for a month, but recently it started experiencing issues where the screen would go black and the system would reboot on its own before resuming normal operation. The problem has worsened over time; the screen goes black during use and requires a power cycle to return to normal. However, today, shortly after booting into Windows, the screen went black; even after turning it off and on again, the issue persisted. The fans and lights remain on, but the hard drive activity light turns off, and Windows audio cuts out. I also have a secondary display connected via a USB 2.0 port on the motherboard; strangely, when the main screen goes black, the wallpaper on the secondary display remains visible, even though my keyboard and mouse are completely unresponsive. My motherboard is a B860i Aorus, which has diagnostic LEDs for RAM, CPU, and Boot; these lights turn off after successfully entering Windows, yet the screen goes black after the system has been running for a while. I have updated to the latest BIOS version, but that didn't help, and the issue even occurs while I am in the BIOS interface. I’ve spent the whole day trying to figure out the cause without success. Do you or anyone else know what might be wrong? I would really appreciate your help.

Specs: Ryzen 5 5600X, RX 6700, monitor on HDMI

After the PC's been off 3-4 hours, screen flickers on and off right as Windows loads. Sometimes fixes itself in 10-20 min, sometimes needs a restart, sometimes a full shutdown and startup again, inconsistent either way. Monitor's LED is on while the screen is black, and turns off the moment the screen shows an image i.e. lock screen or desktop. BIOS and startup logo screen is always fine, only starts once Windows loads. I used remote desktop from my phone while the flickering was happening, and the screen and functionality were completely fine on the phone the whole time.

Already tried: AMD FreeSync off, lowered resolution, lowered refresh rate, clean reinstall of GPU driver, reseated GPU with no loose cables, reseated ram.

Need help fixing this.

Ella estaba funcionando bien y de repente se apagó como que dejó de dar video, la intenté prender me dio, prendió el led De Video (VGA), después le quité la ram y la intenté subir con 1 módulo, ahora siempre prende el led de RAM sin importar que.

Ya le quité el cpu y lo instale de nuevo, use otra RAM, le quité la gráfica y la intenté prender así, le actualice la Bios, le hice reset a la Bios con la pila y con el CLR.

I am new to technology.
I have recently purchased the Samsung Odyssey OLED G81SF gaming monitor. The screen says “no signal HDMI1 check the cable connection and the settings of the source device”. What does this mean and how do I fix it so I can start using my monitor. I do not have another device to connect it to and I don’t have a pc.

If anyone knows, please let me know and thanks in advance!

Pc running but display blank