My late 2008 Macbook Alum has these dents: I know it's caused by rough use (I don't put any protective covers on it..now it's been 5+ years). I remember a few months ago while using it, my hands could feel something...electric current maybe, I don't know. It's still working great, apart from getting slower when using Photoshop, but I'm reluctant to upgrade yet (maybe next year). But if the dents leak electric/power, is there any way to stop it? Putting a cover or something? Or is it time to replace it?