My motherboard Gibabyte Z97-D3H, has developed an interesting pattern.
Whenever I power it off, when I power it on later, there's no post beep. Instead there's some ticking, one per second, I'm not sure where exactly it's coming from. Power cycling does not help, but it's always cured by removing one of the two installed 4GB memory sticks. After that, it successfully boots into Windows 10. I shut it down, put the memory stick back, and then it boots successfully and works.
I wonder if anybody ever saw something similar, and what is the culprit - the power supply, the motherboard itself, or perhaps that low-level integration with Windows 10.