Lenovo M910s - trying to add RAM

Checked the specs, have correct RAM, RAM manuf. even lists the PC as taking this brand/type. (Identical RAM not available)
Checked each of the slots with existing RAM, all good.
Checked it was properly seated

SO why would the BIOS give the beeps for "RAM not detected"?

Is there a "secret" step to this now?

It is possible for two types of RAM to each work but not work when mixed together due to speed differences between the two types. Try running with only the new RAM by itself and see if that works.

Another thing that you could try is to reverse the order of the two types of RAM. Put the new RAM in the low order slots and the old RAM in the high order slots or vice versa.

Adding to what's already mentioned, it could be as simple as bad RAM, or a damaged slot. Static, physical force, bad manufacturing, etc. Do you have another device in which the chip can be tested?

Ideas: https://forums.linuxmint.com/viewtopic.php?t=253057

Not an OS issue. BIOS doesn't recognize it.

Are the RAM chips all the RAM capacity or size or whatever the right term is? That is, are they all, for example, 4GB or a mix of 4GB and 2GB (just to pull numbers out of the air).

I once added RAM to a machine and, as I remember, RAM chips of different size had to be inserted in a particular order.

SIMM & DIMM tend not to work together, & sometimes ram of differing speeds won't either.

Make certain that the ram modules are fully seated, & that the clips are seating.

All good suggestions. In addition, check to see if there are any bios updates that address ram issues. Had a refurb Dell Latitude that would not take a ram upgrade without a bios update. The refurb center never updated the bios to the most recent version.

pizonya,

The Lenovo M910S usually came with this RAM (#4X70M60572), but sometimes with 4GB:

8 GB DDR4 DIMM 288-Pin, 2400 Mhz/PC4-19200.

Plenty of suitable RAM available new/unopened/used on ebay and elsewhere from the likes of Samsung, Micron, Crucial etc.

What is the make and spec of the RAM you are installing?

What are the specs on the original RAM?

^^^

I'm with beachboy2, fire the part numbers of the original and new DIMMs into Google, e.g. #4X70M60572

You should come up with the same specification for both types for the RAM to be recognised: My

Play Bonny!

Replacement stick shipped overnight - all good. 24GB RAM rockin' along
It was the right memory; it just got toasted somewhere.

I have to compliment this memory vendor - instant response. I had bought it through the Amazing store, where the normal procedure would be to return it and buy another one while the refund processed.

This time, when I placed the new order, I told the seller, who immediately shipped the replacement overnight and the Amazing store order just disappeared.

No muss, no fuss. I'll be going back.

Thanks for all the suggestions.

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Glad you got it sorted!