Help! My PC Keeps Restarting and There’s No Display – What Could Be Wrong?

Hey everyone! I'm facing a peculiar problem with my PC that's been happening lately, and I could use some guidance. When I press the power button, it turns on, and all the fans, including the CPU and case fans, are working well. However, my monitor shows no input, and then the system automatically restarts in a never-ending loop.

I've been checking things on my MSI H510M-B Pro motherboard and noticed a few things: the CPU red light blinks for a moment, then the DRAM orange light stays on briefly, and the VGA green light flickers dimly. The cycle repeats back to the CPU light blinking. This issue started without any recent hardware or BIOS changes.

So far, I've tried removing and reseating my single RAM stick in both slots and ensured that my HDMI cable and monitor are fine. Unfortunately, I can't test with another RAM stick since I only have one, and I haven't opened the CPU or motherboard, as they're still under warranty. Any insights into what could be causing this, especially with the DRAM and CPU LED patterns? Thanks in advance for any help!