Your BIOS settings are described in the
Asus X99-A motherboard manual. Specifically, you should pay attention to settings which control memory, processor, and boot/sleep/wake states. Praz is correct, these (and many other) problems are very commonly caused by issues with DDR4 memory voltages/timings. I would advise using the Asus/factory default settings as a baseline, only tweaking what you need (and not overclocking or tweaking other any other settings) until your system is fully stable. You may happen to have a processor with a weak iMC (seemingly not uncommon for Haswell-E parts), in which case you might need to reluctantly increment your DRAM and/or VTDDR voltages a tiny bit to gain stability at faster XMP frequencies, sometimes necessary but best used as a last resort (because it increases heat output and deducts from the available thermal/power budget for the processor, of course, not a lot but it all adds up).
The
Cooler Master G750M PSU advertises support for Haswell C6/C7 low-power states, but it isn't a truly "smart" digital PSU so you may need to manually enable C6/C7 states support in your BIOS settings (for the motherboard and for the processor). Or you can manually disable C6/C7 states in your BIOS settings, which would default to older and less energy-efficient low-power sleep states but guarantee proper compatibility (and sleep/restore functionality) with a wide range of ATX2.x-compliant PSUs.
And the basic troubleshooting stuff:
- ensure both the 24-pin EATXPWR and 8-pin EATX12V power inputs are connected
- make sure your CPU and RAM are properly seated (and hopefully don't have any bent/missing/dirty pins!)
- strip down to just the critical components (mobo, CPU, 1 DIMM, 1 GPU, boot drive, keyboard, mouse), get it booting/working, add/test another component, and repeat again and again until you've confirmed all your components are good and your system is fully built
- pay attention to the motherboard Q-Codes and any specific error codes you see (along with exactly what you were doing when they happened), if a particular error can be consistently reproduced then it can be identified and resolved
- don't overclock or add complexity until you've confirmed the simple things all work, don't run any of the Asus EZ autoconfiguration/overclocking software until you've found (and noted) fully stable and operational stock settings for your system, and don't change any BIOS settings you don't fully understand lol
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