My macbook pro will not start up. I get the apple logo and the little start up waiting avitar. I tried everything including starting with my back up drive and nothing happens.
My macbook pro mid 2012 will not start up. I was running bitdefender and when I went to see if it was done, I had the apple logo and the loading (winding circle) on the screen. I can not get out of this. I used my back up external drive and it did nothing. It did light up.
MacBook Pro, OS X Mountain Lion (10.8.2)