help plz

im having a problem when i start up my laptop. it has a beeping sound. sometimes it goes short then pause then long one. if i press esc or f1 it stop and load. after 5 min things go abnormal..whenever i click a folder to open the next folder get high lighted without clicking it and it will open. sometimes when i click an icon instead of opening its content it will directly open its properties..if i go to shut down options there is blinking into the option preventing me to click the option i want. but sometimes especially if i click esc it gets back to normal. what could be the problem? please share me something to solve the problem. thanks.