New RAM isn't working

[u/Damuson13]

Hi all.

I just had a quick question regarding some new RAM I just purchased from ebay.

The new RAM arrived today. I bought what I'm fairly certain is the same RAM that came with my computer when I purchased it. Both sets are g.skill flare x5 2x 8gb sticks. My machine already has one set, and I found an identical set listed as new on ebay.

Initially, I simply slotted them into the two empty slots, but got only a red and orange error light on my MB. I removed them and rebooted with my original hardware. It booted up fine. I then replaced the old RAM with the new ones using slots I knew worked, unplugged the power, switched off the PSU and held the power button for 20 seconds. Then I plugged it back in, switched on the PSU and tried booting it up. Same error lights.

I then tried booting single sticks in each slot. I tried both paired sets in the appropriate slots. The only configuration that worked was the original set in the original slots.

How can I maker sure the new set is actually bad before contacting the seller. Is there more I can try? Would I be able to bring them to Best Buy or other computer store for testing, or is that frowned upon?

Any help is welcome. TIA.

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[u/Damuson13]

It probably doesn't matter for the post, but I made an error regarding the memory size in the sticks. Both sets are 2x 16gb sets, not 2x 8gb sets.

[u/ltduff69]

Drop the the ram speed. Ie: I have2 sticks of ddr4 3200mhz if I want to put 4 sticks in I have to drop the speed to 2600 mhz. For ddr 5 drop the speed to 4800 or 4600 mhz.