I'm thinking about it. It's just annoying, because I just bought fast RAM for it, and the new boards either don't support it or the ones that do don't use the same type or processor or some other issue.
Electrolytic capacitors do have a limited lifetime. Heat, ripple current and manufacturing faults are the culprits when it comes to failures. Electrolytic caps are based on a gel-like eletrolyte which can either boil away or evaporate over time if the seals have failed. The brown crust is the residue you see from this evaporation.
If you are brave enough to replace this part, you have to make sure you find an equivalent value, size and low ESR capacitor. My biggest concern is that if one cap failed, are the others from the same production batch about to go too.
Just as a point of fact, electrolytic caps are generally rated at 5000 hours life at max ripple current and ambient temperature. For each 10C drop in temperature the life time doubles. The ripple current directly effects the temperature via I^2 * R heating. This is why premium mother boards use solid capacitors which have a much longer life time then electrolytic caps.