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Thanks for reply, addl questions..

If the bearings need lubricated, would they still be running or running w/o any signs of distress? I looked at those; the power supply fan, the CPU fan, and an addl mini fan that I have sitting inside the case (I leave my sides off the case) and they are all running smoothly, quietly, and putting out air.

Do power supplies act up intermittently? I thot when a power supply went out, it simply went out.

Again, I don't mean to argue, I just need clarification. I will ultimately check out your suggestions too. Thanks!!

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Hi again Tgeek,

Appreciate the postback.

In reply to your first query, yes especially those with 3-wire connection since they are variable RPM (depending on a heat sensor that dictates to what RPM the fan motor should rotate). If the PC is a couple of years, then cleaning and lubrication wouldn't do any harm but would maintain if not improve overall efficiency. Additionally, you have eliminated the possibility that the fan is the cause of the "screeching" sound.

Should problem persist (with the fan problem eliminated), then the only possibility left is as you suspected the SMPS (switch mode power supply). The SMPS operates on a frequency above the threshold of the human hearing. In some instances due to full load or no load conditions, the frequency changes (though they are supposed to remain stable). It is very possible for the freq to go down to a level that would be audible. Intermittent operation is not unheard of with PSUs and often the culprit are capacitors. However, often PSUs are no longer repaired but simply replaced.

Would appreciate another postback for any developments (or even the lack of it).


Posted on Mar 25, 2008


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