My system is making a weird sound

Check to be sure the blades are clean and mounting screws are tight. Also that none of the blades looks like it is at a different angle than the others.

Check the cup/cap that covers the connection on top of the hub that has the fan blades...probably making contact and letting out that whoop-whoop noise/sound.
Loosen the screw holding the cup/cap in place and shift it up/away from making contact with the hub

There are many reasons this may happen, but without having the unit on the bench, it will be hard to tell. It may be oscillating, which would make that sound. I worked as a Technical Support Specialist for Harman Kardon. If you are interested in repairing your HK, please visit my website at audioserviceclinic.com. Thank you.

if its a constant wining sound a bearing or cog is worn and needs sorting b4 it fails

Not everyone has the same symptoms for whooping cough but babies and young children might have severe coughing spells that make it hard to do every day activities such as eating, breathing or sleeping. The cough often has a whooping sound (hence its name) after breathing in. Whooping cough can also cause a runny nose and a fever.

Hi and welcome to FixYa, I am Kelly,
This certainly sounds like a low system coolant level issue. Have someone check the system pressures. Low side should usually be 65 to 70 unit running. High side will vary with outside temps any where from 135 - 170. If you do not have good low side pressures it will affect the high side pressures also. This is really the only way your going to sort this one out.

Look around the evaporator and the condenser for any signs of OIL or dark spots caused by oil. That is usually an indication of a system coolant leak.

Thanks for choosing FixYa,
Kelly

This is who answered your question:
http://blog.fixya.com/index.php/2010/05/award-winning-service

LOL. This is a common, easily solveable problem. Remove your cellphone or anything that emits radiation of any sort from the general area. Don't believe me? send a text message while sitting net to your speakers. It does this even if you arent sending a message because your phone sends intermittent signals to the cell tower. the radiation being emitted from the phone does weird things with the magnets inside the speakers.

i had exactly the same problem today with my a200, was is like a jammed sort of sound? like a drilling sound almost :S
im so annoyed. why is this happening?

actually, that's a relay clicking you hear..seems that your main board is really and truly unhappy. This sort of system is a high maintenance type, in case you haven't figured that out.

According to the Samsung website: "The high pitched sound you hear is probably coming from the flyback transformer. The flyback transformer converts the relatively low voltage electricity that comes from the outlet in your home to the high voltage electricity needed to drive the cathode ray tube in your TV. It is not unusual for a flyback transformer to buzz softly when it operates. However, if the sound is loud and high pitched, it probably means the transformer is failing. To eliminate the sound, you will have to get your TV serviced."