Dell Inspiron 15-3521 beeping, lagging and sound issues.

Hello,

for the last few days i have encountered some issues with my laptop. Almost a week ago while i was using spotify, watching youtube, talking on skype and playing League of Legends all of the sound went dead except for the spotify program. Even the system sounds were gone. After a restart it all seemed to have dissapeared.

Yesterday and today i had a different problem but thought maybe these two were linked. Both times i was playing League of Legends and my laptop just started making a sharp beeping sound in about half a second intervals. I could use my keyboard but not the mouse. If i tried to click the mouse it seemed to make the beeping more frequent. The mouse cursor started lagging altogether with the beeping and seemed to move in sync. Only restarting my laptop helped to solve this issue. The windows loading was really really slow and seemed to take around 3 minutes. Usually it takes around 1 minute to load windows. Can anyone help me because it really starts to pile up.

Thank you in advance.