My computer does not recognize some of my external drives, like the internal CD drive that plays DVDs and not CDs. Also it does not see my cell phone mini disk. My Mac Mini is 4 years old. It is on all the time. I shut it down to be cleaned the other day and it would not turn on. After fumbling around with it, it started up. Not sure what the problem with this is ether. Any ideas? I think my computer life is just about up. TG I have Time Capsule.