Well I have a LC5550 PSU and when I start my computer, the PSU starts to emmm... purr. A very loud purr or a quiet growling and after a minute it stops until I start to play games or start to do some hard work on it. So I am asking what could be wrong and if I should replace it? An if so, what would be a good PSU? As you can see from my system specs I don't need much (550 to max 650).