vengeance rgb

My first build is using an MSI MPG Z490 Gaming Plus mobo. I have 2x 16G Vengeance RGB Pro memory in DIMMS slots 2 and 4 (DIMMA2 and DIMMB2). I could power up but could not boot. EZ LED diagnostics were flashing for both "CPU is not detected or fail" and "DRAM is not detected or fail." After...