3 Replies Latest reply: Nov 24, 2010 1:26 PM by Deborah Terreson
da fiddler Level 1 Level 1 (0 points)
My beloved and most used Mac Pro starts up, but wont boot fully, stopping at a flashing blue screen.
It has latest OS, 2.5TB, and 5GB of RAM
Below is what I have done to try and remedy the situation:

Run Disk Warrior - small errors found and repaired
Reseated all Hard Drives
Reseated all RAM

Tried booting with just original RAM.

Booted from Snow Leopard Disk and verified and repaired Boot disk.

This unit is a month outside the Applecare Warranty, and has just received a new power supply that gave up last month.

Is it the original hard drive that is needing thrown away? It is backed up internally to another much newer drive.

Any thoughts and observations would be most gratefully received.

mac pro 2.66, Mac OS X (10.6.5)
  • Deborah Terreson Level 4 Level 4 (1,000 points)
    Hmmm. On a reboot, hold down the 'command'+'V' key - this puts the machine into verbose mode, so you see all the BSD loading up and notice if you get any hardware error codes that have something like this: *cpu 0 caller 0x001e00000* blah, blah, blah.. or if you get a kernel panic:(*we are hanging here...*) is usually what it will output.

    Hard to say what is going on until you dig a bit deeper..
  • da fiddler Level 1 Level 1 (0 points)
    thanks Deborah for the advice.

    Before I read it, I'd tried booting in safe mode - which worked!
    Then I deleted the one login item - microsoft something - now it's booting up successfully.

    Still try the verbose mode? Also any thoughts on preventative measures?
  • Deborah Terreson Level 4 Level 4 (1,000 points)
    I would say yes to the verbose mode and go one further and make it permanent. Coming to OSX from running Tiger on an XPF install on a beige G3 system (totally unsupported by Apple), it was ALWAYS a smart move and even in new machines running hardware they're built to, you can't lose. For the times I do have to reboot, it's good to be able to watch the startup, as you catch immediately if there's a problem with anything. It is verbose after all...

    To turn the mode on, you open the Terminal, and at the prompt, type in
    *sudo nvram boot-args="-v"* and hit enter. It will nag you about using the terminal (if you haven't done so before) and you enter your password, hit enter again and you're good to go. (if you want to turn it off, type in *sudo nvram boot-args=* and hit enter and your password again)