Problem with motherboard or power supply? Need assistance!
Problem with motherboard or power supply? Need assistance!
Your setup seems inconsistent. The new 850W PSU doesn’t power on at all, yet it works with your current GPU when you use the same one. Switching to an older 400W PSU also functions properly. The issue likely lies in the motherboard or cables—not just the power supply. If using a low-wattage PSU with an older GPU works, but not with your current setup, it suggests compatibility problems rather than a faulty motherboard.
They started only in BIOS because the connections weren’t working, and I’ve double-checked the cables. It’s possible the new power supply isn’t compatible with the older system.
Is this the PSU's design, and could it be delayed upon delivery?
It's a modular power supply, so verify that the PSU side connector is fully seated and properly plugged in (for example, CPU connects to CPU, VGA to the GPU PCIe power cable). Make sure you have at least one 8-pin CPU power connection to the motherboard CPU, which powers the 24-pin, and ensure all graphics cards are PCIe-enabled with a single cable per port instead of connecting two PCIe ports with just one cable.
It seems the PSU is compatible with one setup but not another. The newer system doesn’t work with it, while an older PSU does. It’s likely a compatibility issue between the PSU and your system rather than a faulty unit. I’ve experienced similar problems before. My Asus Impact VIII rejects both of my Rosewill Hercules 1600W PSUs but works with any other PSU I own. These two Hercules models, however, only connect to other boards besides this one. It could be that the board is detecting a voltage issue from this PSU and shutting down to protect itself. This isn’t about a dead or broken PSU—it’s probably a matter of board compatibility. If you need a solution, I recommend sending the unit in for an RMA and replacing it with a different model to rule out board-related problems.
I finally understood the issue. Two USB ports on the motherboard were damaged and twisted. The pins that usually stayed apart were touching each other. I carefully adjusted them so they no longer made contact, and now the new power supply works. I think the updated PSU somehow detected the short circuit and stayed off, while the old one didn’t care.
It appears a safeguard is preventing operation, confirming the new PSU functions correctly. Identified a fault and stopped the system as expected.