New RAM stick maybe-DOA, seeking suggestions before returning it

[Riller]

Hello folks, I just received my order of one Kingston HyperX Fury DDR4-2400 SC 8GB stick of RAM, to complement the one of exact same make and model I already had in my PC. After installation, PC won't boot. I have tried the following:

Only old stick installed - PC boots as usual
Both sticks installed in dual-channel setup - PC won't boot, motherboard gives RAM error
Both sticks installed in 2x non-dual-channel setup - PC won't boot, motherboard gives RAM error
No stick installed - PC won't boot, no motherboard error (Big shock there, I know)
Only new stick installed - PC won't boot, no motherboard error

Anyone have any other suggestions on what to do, or should I just send it back to the shop and tell 'em to go fuck themselves and order elsewhere (Not first time I've had issues with this supplier, not sure why I keep ordering from them)?

[MeepDarknessM]

have you tried clearing the cmos before booting so it resets all the settings you had before?

[Bokito]

Speccy is horribly outdated and inaccurate nowadays, try something like HWMonitor for some better info

[Demache]

Those aren't even used for the same purpose.

[Riller]

I've reset to factory settings in the BIOS, not sure if that's the same thing? I looked for a cmos-resetter on the mobo, but couldn't find it.

[QuantumTV]

It's the same thing essentially, the jumper can be a little bit of a pain to find do you still have your mother board manual?

[Riller]

Yeah, it's around here somewhere. Probably.

[QuantumTV]

Well i could suggest memtest but i think it's a bad ram stick

[shredder]

RMA it, less headache.

[Riller]

Well, tested in a second PC, they are absolutely dead. Gonna return 'em. Everybody gets a coin for their help, first to suggest 'return that shit' gets the bounty. Thanks, boys and possibly girls!