Not to be rude: but where did you get the idea that the beep would come from some sort of radio frequency interface and/or from my mobile phone.. That doesn't make much sense because I'm pretty sure my computer only gives off a signal for internet and not radio frequencies...
Connecting to internet doesn't give off any radio signal, it's just a connection. If you use Wifi to connect to internet, yes it does give off signal and is uses radio frequency at either 2.4Ghz or 5.0Ghz.
If your speaker or headphone is not electromagnetically shielded, cellphone radiation can cross over to speaker or headphone and u can hear the a few continuous beeps sometimes especially during receiving calls or sms.
Another thing is: what the heck do you mean by check the cable for any breakage? What cable??
Your headphone cable. If you use speaker (not the system speaker), then ur speaker cable.
Last thing, again not to be rude but seriously what kind of defect might my chipset of the mobo sound card have? Not very specific.....
Only the technician from the mobo company can answer u on that after they do the check-up on ur board. No one from internet, not even ur local computer shop technicians do that.
Since you are not overclocking, max temp u might have even with the cpu at full load can go up to max of 50deg C and that is very far away from the thermal limit of 90deg C of 3570k. So, even if u run full load 24/7, ur CPU is far from any danger.
Last advice , Not to be rude but please watch the tone towards fellow forum users who took their time and effort to help you solve your problem

. We are helping each other out because of our passion not because we owe anyone anything.