I saw a few threads and posts around here about other uses of redundant computer PSU's. I now have yet another reason to recommend to anyone buying one of these fine PSU: to have a spare power supply to play with.

I build my computers myself and get parts as needed. I usually start off with secondhand grey boxes with a dead m/b most likely caused by a dead capacitor. While it can be worth getting a replacement capacitor kit for the board, sometimes its just easier to get a shinny new motherboard. More CPU power, memory and a video card and you're good to go..
But eventually the old fan in the PSU will start to fail. Mine announce they're peril by making that horrible groaning bearing noise. Sometimes it's a dull grinding sound. Sometimes its that pulsating irritation that is so good for your arteries. Either way the PSU has to come out off the computer case and the fan inside the PSU has to be replaced. And Jaycar have a nice range of drop-in replacement fans. There is also plenty of info on the net to show you how to change the fan.
But the last fan I bought was a cheap non-ball-bearing type and though it is running fine now, the wind noise of the new fan sounds like a jumbo jet taking off inside the house! So I lashed out and bought my first Corsair PSU, a HX-650. Yes, the are expensive (~$165Au, possibly cheaper on EBAY), but boy are they quiet.
The reviews on the net favor this product but it's not until you've owned one can you really appreciate the how nice they are- or at least how terrible the standard garden variety PSU design is.
I have two of these Corsair PSU now and I am in the process of replacing the remaining old ones. I should also say just as our host Dave points out, for example in his Fluke meter reviews, is that just because you are buying a brand, you may not be getting the best designed/built product in the range. Not all Corsair PSU's models are created equal so do your research on the particular one you may be planning to buy.
I couldn't recommend the Corsair HX-650w highly enough. If you find the fan noise of your computer distracting it may be worth considering.
