Memory only works in two slots

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   I have ASROCK Z170 PRO4 v 7.50

If I add DDR4 to either , or both of the 2 slots closest to the CPU, system boots,  and everything is OK . But this is highly undesirable because its not in DDR mode. and I can't use all four slots.

If I add a stick to either or both of the other two slots, the system will not post. It just sits there doing nothing forever, but I can sorta hear the CPU fan surging.  

I've tried the same two sticks that worked in the first two slots in the others, so I know my memory is OK.

Ideas?  TYVM

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spydox Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 30 Jan 2024 Status: Offline Points: 35	Post Options Post Reply Quote spydox Report Post Thanks(0) Quote Reply Topic: Memory only works in two slots Posted: 30 Jan 2024 at 10:12pm
	I have ASROCK Z170 PRO4 v 7.50 If I add DDR4 to either , or both of the 2 slots closest to the CPU, system boots, and everything is OK . But this is highly undesirable because its not in DDR mode. and I can't use all four slots. If I add a stick to either or both of the other two slots, the system will not post. It just sits there doing nothing forever, but I can sorta hear the CPU fan surging. I've tried the same two sticks that worked in the first two slots in the others, so I know my memory is OK. Ideas? TYVM

Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 22793	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 03 Feb 2024 at 11:29pm
	Have you tried reseating your CPU? While you have it out of the system check the CPU for any warping/bending of the substrate (the green PCB). Intel switched to a thinner substrate with the release of Skylake and it had a nasty habit of warping when too much mounting pressure was applied by the CPU cooler. Some critical memory controller connections (contact pads) on the CPU are located on the outer corners.