Tuesday, 13 December 2011

Mac Pro startup trouble - White screen with no entry sign

On start up, mac makes startup noise, goes to white screen with Apple Logo and spinny thing at bottom, then after about 2 minutes the Apple Logo changes to a grey No Entry sign. Still the spinny thing at the bottom.

I've tried:

  • reset PRAM/NVRAM (same thing)
  • holding down "alt" and selecting Windows partition boots to windows perfectly!
  • single user mode
    • comes up with "Still waiting for Root Device"
  • netboot - using deploy studio
    • repair disk permissions is Disk Utility
    • set startup disk to OS X
  • reimage OS X

Found this apple article, although it's dated back to 10.1, and 10.2! Goes on about reseting PRAM, reinstall OS.

Finally, I thought I would try the Hard Drive on another machine, so I "firewired" it up to the machine next to it.

  • I booted the broken one off the working one. Worked fine
  • I booted the working one off the broken one. Worked fine
So I knew that both installations on both Hard Drives worked fine. To boot I held down "alt" and selected the firewire OSX to boot from. It appeared that using the "alt" key to select an operating system fixed the problem.

I then tried holding down the "alt" button, selected the OS X partition which wasn't working, and it worked fine!!

So, I finally concluded that it was down to the "bless" command you use. The one with Deploy Studio (which is how I set the boot disk originally) seems to not work with this machine.

So, to fix this:
  1. I booted the machine on it's normal OS X partition (holding down "alt" to select the OS X partition)
  2. Went into "System Preferences" and "Startup Disk"
  3. Selected first the Windows Partition, and then the OS X partition
This hopefully set the "bless" command right again.

It worked!!

1 comment:

  1. Well, it seemed to be a reoccurring problem, and this last time it happened the fix above did not work.

    I ended up installing OS X on a seperate internal hard drive which still did not fix it.

    After this I tried removing the original hard drive and it booted up fine. I then put the original hard drive back in and all was fine once more.