Hmmm, as much as I hate, loathe, and f*rt in the general direction of Microsoft, it could be a hardware problem.
(Although if we hardware types evah turned out the cr*p Microsoft has done, we’d be sued out of business.)
You might be right about it being a hardware issue. But it just happened after I installed Windows 8.
Windows 8 was the reason I bought a Mac. I knew I would have to “do something” in the near future and didn’t want to beta test ANOTHER M$ OS. I use Ubuntu as well but the Mac is easier in the corporate world than Linux desktops.