random beeps on windows 7 64bit

ill get a beep i think i know when it happens (when i play a youtube video, and less than a minute after the video is paused or over) i went through the windows system sounds and nothing sounded like the beep. This is a newly restored laptop and i heard it before and after i restored it. what can this mean? whats the worst that can happen? i never listened close enough to hear it come from the speakers, but i know i can hear it from my headphones. and i sometimes hear it when plugging in a pair of headphones.

Could you describe a bit more about the beeps? One beep, repeated beeps, long beep, etc?

its one short beep, not loud at all. this computer is a dell latitude e5420 with a i5. and already tried reinstalling the drivers from dells website

I've done a little search on the issue and it seems that the beeps are telling you signs of overheating. You might want to take note of making sure there's a cooler pad at the bottom of your laptop.

the laptop is not overheating, i used a software to check. and feeling the vents its running pretty cool. i know when it gets hot... since i played minecraft and it will feel hot. i always have a cooling pad (with no fans) under it