I constructed a personal computer.
I constructed a personal computer.
I’d remove everything from the case and organize the components inside, which can sometimes make things clearer. If you had extra CPU or RAM available, you could investigate further to see what’s causing the issue. This process really tests your problem-solving skills. Often the problem lies in one area—like power supply, motherboard, RAM, GPU, or even BIOS settings. Sometimes it’s just a simple fix like reapplying the CPU settings, which took me about seven attempts before it worked and I was ready to move forward.
MOBOs typically lack built-in GPU unless it's a laptop. If it has HDMI or DisplayPort ports, it's likely using an integrated iGPU that it doesn't have. This won't function properly. @Panda966 you're right—it's still early, but the cable is installed. Make sure the PCIe connectors on the power supply are securely plugged in. There don't appear to be any frontpanel buttons connected. Would you try booting it by shorting the two left top pins on the front panel connector cluster?