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Re: the battery light on the tower stays on.
Pull out the pwr cord and press the pwr button for one min and then release. this process is called as power drain. replug the pwr cord at the back of the computer and check. if its works then good or else replace the SMPS the power unit inside the computer. for sure it has gone bad. power unit is easily available in nearby retail outlets.
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Sounds like you have a build up of dust collected in the fan of your computer which will cause the sound you described.
If you are comfortable with computers, go ahead and open up with the computer tower and use some of the compressed air cleaner you buy at Best Buy or Office Depot to clean it out. This should solve the problem :)
If you are not comfortable, take it into a computer repair store and explain the situation. It should be a very quick, inexpensive fix on their part.