Answer

The "S/K" white LED indicates you are using Kaby Lake-X CPU, and this CPU only supports DIMMC1/C2/D1/D2, please reinstall your memory to DIMMC1/C2/D1/D2.

Reference

Models

  • X299 GAMING PRO CARBON
  • X299 GAMING M7 ACK
  • X299 TOMAHAWK
  • X299 XPOWER GAMING AC
  • X299 GAMING PRO CARBON AC
  • X299 RAIDER
  • X299 SLI PLUS
  • X299 TOMAHAWK AC
  • X299 TOMAHAWK ARCTIC