Buzzing noise on and off about every 2mins ( New desk top computer ) Is this normal?

This board seems to have some bad electrolytic capacitors. The noise you hear is the lack of filtration that they provide. It should be gone through by a technican. If you want to look into this, I can help if you let me know, you may can spot these if you open it up. They look like little cans with an X on top. I'm sure it has many.

this buzzing noise is normal it is cause by flowing liquid refrigerant inside of evaporator coil.

Hard drive is trashed - will not tolerate a drop.

the buzzing noise is normal for that model .. first it makes noise as it charges and maintains the capacitor then when it auto focuses ..
here is a discussion of your speedlite model and the buzzing it produces

http://www.cameralabs.com/forum/viewtopic.php?t=19864&sid=ed65281bc80849c5fa34264a56c5f9f4

Caveat emptor, welcome to the life of DIY.

Below is an image of rear side of your TV, Sony KDL-40W5500
Top right corner is marked there and possible cause of noise seems back light inverter board, there are high voltage going to CCFL inside LCD panel and seems high voltage leakage causing that buzzing/ fuzzing noise.

Replace back light inverter board upon voltage leakage confirmation.
Thanks.

uninstall the sound driver and reload. if this didnt work, reload the windows.

The buzzing noise would normally be either a fan or color wheel that is failing.

I wouldn't recommend leaving your PC on all the time but don't think this should have harmed your new power supply. The power supply may be faulty so try speaking to the store you bought it in to try another one. Alternatively, I would try moving your PC to a very well ventilated area at your desk to see if this helps.

switch your subwoofer off from the socket for at least 30 minutes and check if the noise is still there,if its still there open it and play a movie then press it lower if the sound stops then you will have to put some toilet papers at the back of it ,thats what I did to mine.