17" MacBook Pro won't start!
Normally it acts like it wants to boot:
Grey Apple & Progress Bar that goes on about the first third of the way and then
either goes white forever (never shows anything expect a white screen) or it drops
to black with a little chunk noise and does it all again but still never goes beyond
the white. I've reseated and swapped out the memory, done the SMC reset; and even
taken the hard drive out and booted up my MACPRO with it in a USB adapter box (nothing seems wrong with the hard drive).
It "will" start up in Single User Mode and I ran FSCK on it which didn't help!
It's got El Capitan on it.
Oh, I also tried to start up from another external hard drive I have with 10.9 on it (but maybe that's too old).