all ram slots not working

AMBIL SEKARANG

The second RAM slot on the motherboard isn't working for me. | MSI ...

If your RAM is not working after putting it in the RAM slot, do a test to rule out the cause.

ASUS ROG MAXIMUS Z790 APEX ENCORE LGA 1700 ...

On booting the PC, I discovered that both B1 and B2 RAM slots were not working. PC doesn't boot if I put RAM on either B1 or B2 slot.

One RAM slot is not working - only beeping

So my two DDR4 RAM which are same in everything, used to work together before, but all of a sudden they are not working together.