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Strange sounds when computer is turned on

Thursday, November 11th, 2004 by | Filed Under: System Tune-Up Help, Uncategorized
 
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Q:
Help! My computer just started making a strange sound when I turn it on. It sounds like rapid ticking or rattling (not hard drive sounds either) and goes away after a few minutes. Any ideas?

A:
Sounds like a problem with one of your fans (no, not the people who love you, the ones that blow air).

Your computer probably has two internal fans – one that sits on top of the CPU and one inside your power supply. Most of the time the sound you’re describing comes from the fan in the power supply. They can make that annoying noise for a long time before they finally belly up and die.

However, if it’s your CPU fan, you may have a serious issue. If that puppy dies, your CPU can turn to toast in a hurry (and trust me, they’re not very good with butter and jelly).

So, the best advice is to wait till your computer is completely cooled off and remove the case cover. Turn the computer on and see if you can determine where the sound is coming from. If it’s the CPU fan, that’ll need replaced.

If it’s the power supply fan, you’ll need to replace the entire power supply to get rid of the noise. If you think you’re going to open the power supply and fix the fan — don’t. They’re not user serviceable. Besides, if you touch one of its capacitors on accident you’ll take a nice little flight across the room.

You may want to listen to your hard drive too (it’s the square, slim box looking thingy). The sound described in the question above probably isn’t hard drive related, but it’s always a good idea to give it a quick listen.

Remember, most of the time these power supply fans still work for years after they start rattling, so usually there’s no rush – just keep a close eye on it. If that fan dies, your computer can overheat in a hurry.

Oh, after you’re done playing with your machines innards, be sure to put the cover back on. Believe it or not, your computer can overheat with the cover off. The computer is designed to pull air through the case in a certain pattern. If there’s no cover, the airflow is all wrong and things don’t cool as they should.

~Steve

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