Some time ago
My Mac Pro 1/1 froze with an orange pattern across the screen.
I forced shutdown with the power button.
Restarted and could not get to the desktop.
I saw the orange pattern over the apple and the gear as it restarted
No desktop. Just a beach ball at the moment the desktop should be visible.
Tried to boot with another drive. No joy. Same thing happened.
Left it alone for some time. Restarted. It works
After 5-6 hours of no problem. It happens again
I forced shutdown and could not get the desktop to load
I then took it to the Genius Bar.
They tested the machine. Everything is in good working order
But my main boot drive would not show up as bootable.
I could not recreate the hour in my 2 hour visit.
Get home, start it back up. It's working fine. Like nothing ever happened
As a matter of fact, the drive that would not even show up as bootable at the store,
Started up like it should without any prompting.
The machine has worked normally for some time. For a month now I've had no sightings of the orange pattern.
Then it happened again last night
The orange line design is back on my screen
I was watching a few YouTube videos full screen last night then the last one would not close.
Beachball rolled for 10 minutes so I hit a bunch of esc space enter option control and clicked.
Beachball disappeared but the video was still full screen.
After a few more minutes I clicked again and beachball comes back.
5-10 mins later I give up.
Force a shutdown and
Go to bed
This morning I turn it on and the orange pattern is across my screen.
I see the apple, the gear
But no desktop
Restart it a number of times with the result, ending with a force shutdown.
Heard an unusual beep one time when I restarted.
Even tried to boot into another partition with the same result.
Zapped the pram
I've unplugged everything and am waiting to restart when I get home from work.
Has anyone ever seen this before?
I would post a picture if I could but I'm on my iPhone and don't see any upload area if there is one.