X99S, black screen memory problem?
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Solved by runit3,
The problem is no longer an issue just curious what caused it. Can it be that the RAM is 2666mhz and the 5820k only supports 2133 without xmp
Very doubtful, as the RAM would have loaded JEDEC defaults on first boot. My best guess is that one of the pre-POST checks failed in some way. X99 boards (at least all the ones I've used) run through a series of pre-checks on the RAM, could have just been a fluke and hung on one. As the X99S has no code readout it would be pretty hard to diagnose, and since everything is working fine now, not much point in trying to replicate it.

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