There’s typically a guide that will tell you exactly what the beeps mean when you start it up (that comes with your motherboard). There’s a bunch of different variations that mean different things are not connected properly. (It all sounds like Morse code nonsense but means a very specific thing) There is no standard and what the beeps mean can change from company to company.
If you are not seeing anything on the screen and there’s a big beep it does mean that the computer didn’t pass the self test.
If this happens right after you installed the ram then a couple of different things might be going on.
Are you sure that you installed the ram properly (is it seated well and clipped down)?
Are you sure that it’s compatible with your motherboard?
Are you sure that the ram isn’t defective?
Take out your other stick of RAM and see if it is the same type (look for numbers). Maybe even take all of your old ram out, move the new ram to the #1 position and try to start the computer (with the old ram out).