I'm sorry to hear about the issue you're experiencing with your PC. Based on the information you provided, it seems that your PC is not powering on properly when the GPU (RTX 3070) is connected to the PCIe slot, and it only powers on without any display when the GPU is removed.
Here are a few troubleshooting steps you can try to resolve the issue:
1. Check Power Connections: Ensure that both the 24-pin ATX power connector and the 8-pin PCIe power connectors from the power supply are securely plugged into the motherboard and the GPU respectively. Make sure they are properly seated and not loose.
2. Power Supply: Although the Seasonic Focus GX-750 is a good power supply, there is still a chance that it might be causing the issue. If you have access to another power supply, try connecting it to your system to see if the issue persists. If the PC powers on properly with the other power supply, then it might be worth considering a replacement for your current one.
3. GPU Seating: Make sure that the GPU is properly seated in the PCIe slot. Sometimes, due to improper alignment or loose screws, the GPU may not make proper contact with the slot. Remove the GPU, clean the contacts with an eraser or isopropyl *******, and reseat it firmly ensuring it sits properly in the slot.
4. Update BIOS/UEFI: Check if there is a BIOS/UEFI update available for your motherboard. Sometimes, a BIOS update can resolve compatibility issues with new hardware. Visit the manufacturer's website for your motherboard model and download the latest BIOS/UEFI version. Follow the instructions provided by the manufacturer carefully to update your system.
5. Check for GPU Compatibility: Ensure that your motherboard supports the RTX 3070 GPU. Check the motherboard manual or the manufacturer's website to confirm compatibility. Also, make sure that your motherboard BIOS/UEFI is up to date as some older motherboards may require updates for compatibility with newer GPUs.
If none of the above steps resolve the issue, it could indicate a problem with your GPU itself. In such cases, it may be best to contact the manufacturer's customer support for further assistance or consider having the GPU checked by a professional.
Please note that if your PC is under warranty, it's always a good idea to contact the manufacturer or retailer for support before attempting any repairs or replacements yourself.
