My pc. hiya my lg pc wont swich on for some reason was working fine last time we used it now when

Question

hiya my lg pc wont swich on for some reason was working fine last time we used it now when i turn it on it either carrys on making a bleeping noie then stops then does it again so i reset it and then it trys to come on but dont make a bleep noise at all , its always made a small bleep as it turns on just wondered if you new what the problem was hope ive explained it ok thanks