FYI- Lou is right as usual. The "Caps" that Lou is referring to are called electrolytic capacitors. As they age, they often leak and weaken. This is why it has worked fine and may slowly develop issues. When these electrolytic caps blow, they can bulge at the top, blow out the top, or blow the whole can off the cap. The last one is one of the few things in electronics that we technician still haven't mastered, and that is getting the smoke back into the cap. For some reason (still unknown to this technician), when the magic smoke in the electronic components gets out, it is nearly impossible to get it back in.
Once the smoke gets out of one component, others may go also, but the equipment stops working. So, as Lou recommended, I would get it to a shop if it's not under warranty. It may be a cheap repair now, but if that smoke gets out, that will cost ya'!
If one of the caps is leaking, you can see an oily substance on the circuit board around the capacitor (I use a magnifying glass to see it), and it often holds dirt. The electrolytic inside the cap is corrosive to the circuit board and can damage the board with long term exposure to the electrolytic. Depending on the capacitor, most are less than $1.00 USD. May be cheap now, expensive later (if that is the actual problem).