Sounds like one of three things... A CD not seated correctly... 2 internal Fan maybe bad or 3 your Hard Drive could be failing.
Make sure you have a back up... use a thumb drive i you can... faster.
If it is the HD then the noice would change as you are doing tasks. As its working it will change tunes.
A Fan may stop and start... there is a fan vent at the side or bottom of the laptop... see if it is coming from there.
Disable your sound or mute it. then switch on again. if you hear thesame sound it means your should format your pc. if you don not , then your speakers are failing. also try using an head-phone.
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