Now that I've had a night's sleep, I now understand what you mean.
I think I'd be looking at the BIOS or Memory, but generally when you have problems with the memory, a machine won't boot.
If you have more than one RAM module installed then leave just one in and see if that makes any difference and then try the other(s).
Sometimes the pins can need a clean which you can gently do with a pencil eraser and then brush off any residue.
Ensure you only handle the cards by their edges and notice the position of the slot on the module.
As for the BIOS, if you are using an OEM branded computer, then go to its support site to see if there's a BIOS update, else Google for how to reset it for your make and model.
If you are using a purpose built non-branded machine then you would need to go to the motherboard support site for the BIOS update.
This site may also describe how to reset the BIOS.
If you find that the machine has problems booting with a particular RAM module then it will need replacing.
To ensure you replace it with a matching one, download the free version of Speccy which will give you the manufacturer and part number and then you'll need to Google for a supplier.
https://www.piriform.com/speccyExpand RAM and then the Slots.