^ What this guy said. I've used cheap offbrand macbook chargers that made all sorts of horrid noises. Cheap PSU's aren't worth the risk, they whine, heat up and I don't trust them with electronics I can't easily replace. Either get an original PSU, or buy a nice one from mouser or digikey. Meanwell makes good PSU's in a million different varieties, that's what I bought for my CMVS and it's cool, silent and has a nice power LED so you know if it's plugged in. You can also often find good quality PSU's lying around the house because a lot of inkjet printers and scanners use PSU's of the correct amperage and voltage. Just watch out that if it's a barrel plug (seriously, fuck barrel plugs) that not only is the outside diameter correct, the inside pin diameter is the same too. I spent hours taking apart and reflowing solder on a phono pre-amp trying to get it to stop cutting out only to realize I used the wrong generic wall-wart and it was only occasionally making contact, even though the plug felt totally solid.