ddrana103make sure ram with same mhz and same capacity with single sided or dual sided.
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Detailed description：My ASUS Prime 250M-A, Core i5-7400, initially had a single Kingston 8GB module (9905702-017.A00G) channel 1A. I added a Corsair 8Gb module (CMK8GX4M1A2400C16) in channel 1B. All was good.
When I added two Corsair 4GB modules (CMK8GX4M2A2400C16) in 2A & 2B my desktop would not boot. I tried the 2 new 4GB modules alone in 1A & 1B and it boots fine.
What do I need to correct?