I'm experiencing a strange issue with a couple of Be Quiet PSUs (ref. Efficient Power F1-350W) and a SuperMicro motherboard (ref. X9SCM-F).
In fact, the supermicro MB works fine with another PSU, but when I use a BeQuiet PSU, I can't power it up.
To be more precise, when I switch on the PSU, the Motherboard begins doing its pre-check (onboard LEDs light up, IPMI chip boots up, etc...), but I can't start the computer. Even manual contact on the power pins fails to power it up. I've got 2 BeQuiet PSUs (same model), and they both fail to power the board properly. However, with a supermicro PSU, everything works fine.
The BeQuiet PSUs are brand new and work fine with other boards. I have contacted supermicro support guys, and they told me this issue was probably related to a Power Good Signal timing issue. I think this is the right diagnosis. Their motherboard may be slightly more sensitive than others, and may require the Power Good Signal to be sent faster or slower than other MB models. Unfortunately, there is no information about the Power Good Delay in the specifications of these PSUs. Since these BeQuiet PSUs are not compatible with this MB, I need to find other ones, and this piece of information would greatly help me to avoid doing the same mistake...
Many thanks in advance for your answers,