I so had the same problem with my first, he pressed, turned, pulled, chewed, dribbled, pushed and stuck things in my old HTPC system and my amp. I bought a TV cabinet and taped the glass doors shut (had to retape every few weeks as he'd get through that as well). He's 3 now and has his own PC so is no longer interested. Unfortunately we now have a 10month old lad who I've noticed recently has his eyes on it all now - the sticky tape is coming out again this weekend to catch him before it all starts again!
...and even though I have an old sky remote for the boys to play with that we no longer use; why oh why do they only want to chew the remotes I use???
Lastly, I had an old keyboard which I chopped the cable off so they'd play with that instead. Now both boys think keyboards are toys - I can tell you from experience that a baby hitting all the keys is a lot worse than one pressing the power button! LOL!