desktop speakers

Let me preface this with the fact that I don't know if this is the correct forum for this question, as this is the first time I've used this website. My apologies if I'm cluttering this section with an irrelevant question. Anyways, I am building my first hifi setup and I have everything except...

Wonder if anyone can solve this. I have a pair of sony srs88 desktop computer speakers from 1990.When plugged in, one of them buzzes whether it is turned on or not. When I do turn it on the pitch of the buzz is much higher..... here's the kicker....when I lay it on it's side, no buzz. Upside...