while booting boot manager screen and continuous beeps

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Honorable
Jul 16, 2013
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I have dell Inspiron 5520 laptop .It's one year old . When I start my system I get continuous beep sounds but after booting I can login. I have two OS windows 7 and Ubuntu . When I don't get beep sounds I get boot manager screen . I have one more problem when I login into windows my touch pad stops working in between and some times it works fine. When I login into ubuntu my touchpad works fine without any problem but when i open up the terminal it starts typing ~~~~~~~~~~~~~~ automatically I don't know what is the reason for the strange behaviour, is it because of the hardware problem or some virus problem ,Is there any need to format the system
 
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