[rshaffer61]

Like I mentioned disconnect power from all drives. That will eliminate them as the source of the sound. Turn system on and if sound still happens it is one of possible 3 fans.
PSU
CPU
Secondary case fan

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i'll see what it is and since you already gave me the fixes,I may not post a reply but thanks a lot anyway.

[gold_y]

i'll see what it is and since you already gave me the fixes,I may not post a reply but thanks a lot anyway.

[rshaffer61]

OK it would be nice if you could post the results as it might help someone down the road with the same problem.

[gold_y]

you mentioned dusty CPU fan.Could it mean the problem may have been caused by me having left the side panel open for a while??

[rshaffer61]

Could be if the fan is not turning at the correct speed and it is really bad to where the bearings have dried up or covered in enough dust that the fan will not start right away.
When you turn a system on the fans should start immediately and if they hesitate for a moment you might hearing a grinding or screeching as the internal of the fan starts but the external fin part is not moving.

[gold_y]

ok then i 'll look to cover it up after cleaning the fan.That should fix the problem as the side panel has been open for a while and am sure it would fix the problem

[rshaffer61]

The only way to tell is to blow everything out with a can of compressed air. If the fins on the fan are still covered use a Q-tip to clean them out.
Also make sure the vents on the PSI are cleaned out good as that will create a overheating issue as well as cause the PSU fan to have the same issue.

[gold_y]

vents on PSI??

[rshaffer61]

Sorry the vents on the Power Supply Unit . They can become coated in dust and can cause the power supply to overheat and not be able to exhaust the hot air inside the system.