PSU fails if the 8-pin connection is improperly made.
PSU fails if the 8-pin connection is improperly made.
Hey there, I saw the issue clearly. Using just the ATX cable seems to work perfectly, but once you add the 8-pin cable it stops functioning. Could this be a compatibility problem? The seller claims the PU is compatible with older motherboards and mentions changes in ATX standards that might affect older power supplies. That sounds plausible. Also, note that the board has a 24-pin ATX connector, not just the 20-pin one. Old post: Essentially, I own two PSUs—a BN074-BQT P7-Pro 750W and a Bequiet Dark Power Pro 550W (name unknown)—plus two motherboards: B550M Gaming and MSI Pro A620 M-E. The new PSU fits both boards, but the 750W model only works with the B550M Gaming. Connecting it to the Pro A620 M-E gives nothing. Are there any compatibility concerns? Thanks for your help! — Joshua Platt
Edited October 17, 2023
Compatibility is generally fine unless your PSU is very old and lacks the 24-pin connector for the motherboard. You might encounter issues if the power-up pin (often green) is slightly loose or bent, preventing a solid connection when you press the power button. Also, verify that the front panel connector is correctly attached. Different boards can rearrange the wiring, so the power button might connect to an internal speaker instead of the intended port. Another possibility is that it's a proprietary PSU without standard cables—this is common in pre-built systems from Dell or HP where you must purchase specific components. Hope this clarifies things!
There are various kinds of 8-pin connectors, yet they need different keying methods. The EPS connectors and PCIe 8-pin connectors seem alike but aren't compatible. Unless you force them together, mixing them shouldn't work. Are you asking about a modular power supply? If so, verify all cables match the correct port on the unit. That should assist.