I have a dell in the back of the house that has blown 2 power supplies this month the pc before it was a compact that worked fine for three years.I have a hp in the dining room that blew 4 power supplies in one month I bought a atx 450 power supplie for it two months ago and started unpluging it at night I have not had a problem with it for two months now.ps the one up front was only blowing when I turned the pc on before I started unplugging at night.