Currently Being ModeratedFeb 9, 2013 10:09 PM (in response to FUNKSTICK)
This type of anomaly suggests a hardware fault in the system, likely with the GPU and/or the video RAM it uses. Sometimes specific uses of the GPU can spur this in a faulty system so while it may not happen for a while, it may suddenly kick in. When it happens, try booting the system to the Apple Hardware Test suite (see here for how to do this: http://reviews.cnet.com/8301-13727_7-57352461-263/how-to-invoke-and-interpret-th e-apple-hardware-tests/) and then see if any errors are detected. Additionally, you can try booting to Safe Mode or to another OS X installation on an external drive to see if the problem persists there (especially if it continues on your current OS installation after you restart).
Currently Being ModeratedFeb 10, 2013 11:47 PM (in response to Topher Kessler)
Thanx for your reply
I tested the machine and it appears all the ram is fine, CPU good.
All sensors all good.
It passed every test except one of the hard drives (my main boot drive, I think) failed a scan
But I can't understand how that would be the cause of the orange lines and no desktop coming up on any volume.
I've booted into another drive in safe mode as you suggested and the desktop has been made available, but the pattern is still across the screen. It does however, allow me to work.
I verified all the (4) volumes with disk utility. They all appear to be OK.
When I took the machine to the Genius Bar the last time this occurred, the gentleman did the tests of the CPU and GPU and found everything in working order. (The main boot drive was the only thing that would not appear bootable and once I got the machine back home it worked fine... And let me add again, the pattern did not show up at the apple store)
I've been waiting to buy a new Mac Pro for two years but was hoping for a significant upgrade before I would buy. Thinking that I'd settle and then the next week Apple would come
out with my dream machine.
Of course anything would be much better than the Mac Pro 1/1 I've been working with.
I am about to go buy an iMac and be done with it.
Though I hear tell of a new Mac Pro soon to be released.
With this problem not resolving itself, I don't believe I will have the patience to wait much longer.
I've got work to do.
I don't know what else I can do.