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Last week I purchased some components and assembled the PC. When I turned it on, all the RGB lights came on but nothing appeared on the screen. My dad and I managed to get it working eventually, but then it started again yesterday. Now I've tried everything possible and nothing is displaying. The parts I used include a Prime X670-P motherboard with Wi-Fi, 6400MHz Kingstin RAM, an AMD Ryzen 9 7900X3D CPU, an RTX 4070 GPU, a Corsair 750W power supply, and I've tested all connections and settings. I've also reset the CMOS and tried the RAM module separately, but it still doesn't show anything on the display. However, the RGB lights inside the case are functioning normally.
Did you attempt without the GPU on the IGPU? Were you checking for a BIOS update? You have a BIOS flashback button. Edited November 26, 2023 by leclod
I believe I referred to it, though I wasn't certain. I played on it on Friday and everything seemed normal until I powered it off. I flipped the PSU switch, removed the PSU plug, and then restarted it. There was no display, but the case lights were on. Also, after updating the BIOS, the issue persists with no display.
Generally, the setup will automatically choose the iGPU unless you adjust the BIOS settings. This can be frustrating since it often happens. You'll need to revert the BIOS back to its original state—effectively resetting it—by removing the CMOS battery for a few minutes and then reinserting it. While the GPU is out, turn off the system and unplug it from the power source before it attempts to boot up. Once you reconnect the battery, try launching the system and observe the outcome. If a display appears, enter BIOS to configure the PCI-E slot, save your changes, and power down before the system tries to reapply the BIOS setting. This approach may resolve the issue, though it depends on your specific setup. I remember a similar situation where switching to a non-iGPU solution was the only way forward.