Just moved to the UK (here for two years). When I plugged my MP in using a small adapter plug I hear a small buzzing sound from the area of the power supply (a sound I don't remember hearing before). Should I be using a specific adapter, or should I buy a UK spec cord to plug in and skip the adapter plug? I've shut everything down now as I'm afraid I might be slowly marinating my machine in unwanted volts. Any advice would be appreciated.