I'm asking this because when I was replacing my laptop battery, I accidentally hit and broke/disconected one SMD capacitor off the board, then I turned my laptop on, it made some weird electrical noises while booting and apparently is working fine without the capacitor.
I'm worried because I'm overseas in the UK and I'm don't know how much they gonna charge me.
You've just rediscovered Muntzing.
Quite often you can remove some specific component on a circuit board and the device will keep functioning - but not as well, capacitors being the primary target.
A lot of components are absolutely crucial, but some are there to make the device "better". The capacitor you dislodged was likely mounted in parallel with other capacitors to increase the capacitance near a specific part. The remaining capacitors will "take up the slack" but it might be that you will see one of these effects…
You have already discovered one effect. It appears that under load, you can now hear audible noise. This could very well be because other capacitors have to pass more current, and because they are microphonic (which works in reverse too), they can emit sound.
If I were in your situation I would make sure that the data is safely backed up (because any bit-flips may alter data if written out to storage), and then keep using it.
