I've cleaned dust off the computer, I should've switched a fan when I've had the chance, this computer has been hot for quite a time now, no yellow liquid was leaking out when I've inspected the hardware, sadly I'm not extremely educated in that term, so it takes me slightly longer to recognize the motherboard, the graphic card and the RAM, as well as harder.
I will wait until both my friend and father return from abroad and try to see what to do, as well as next week I might be able to get more face to face help.
I'm still in mystery about the beeping though, I doubt the heat alone would cause such distruption in the devices and lead to horrible performence, I haven't mobilized my PC before it happened quite a lot, unless moving it back and forth to connect earphones to the back counts as mobilizing, one person told me, that when she had very slow performence she took out her RAM, put it back in and everything was alright again, but I'm too worried I might cause damage so I will have to wait for people with more experience to come and assist me, many thanks for your comments anyhow, they have helped me see the elaborated image of scenarios which might reflect the situation, I will take notice of anything said here and definetly use it while consulting.
Cheers all.