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Mac Pro Early 2008 DSMOS has arrived, screen flickers orange

Hi there! My early 2008 Mac Pro, running OS X Snow Leopard, started having graphical glitches and imminent freezing randomly. A few days later it began to refuse to boot. It reaches the Apple logo with a spinning gear below it, although the gear freezes and the screen flickers orange every few seconds. I tried resetting the PRAM and SMC to no avail. I then attempted to perform a safe boot, only to have the same issue after the progress bar disappeared. I then performed a safe-verbose boot, images of the results attached. It seems to hang and flicker once it reaches “DSMOS has arrived", although reading the lines above I'm sure those are linked to my issue. I'd be eternally grateful to whoever helps me out.

Having had the Mac for so long, I do not remember the exact specifications. I'm quite sure I had an Octa-core with about 8 gigabytes of RAM. The GPU is an NVIDIA GeForce 8800 GT, although the original 8800 GT shipped with the Mac failed once before and was replaced.

Sorry for my limited knowledge of Macs and Linux, I've been fixing my Windows PCs with ease but haven't really messed about with a Mac before. Note that it's been some time since the issue occured, I've been using my year-old Ryzen 7 build just fine but I'd love to get my Mac up and running.

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EDIT: forgot to mention that running an fsck -fy in single user mode printed that the volume appears to be OK. It also printed that the file system was modified.


EDIT 2: Just to clarify, I do not need help in installing Mac OS X. That was already done a long time ago, and the last time I upgraded was from 10.5 to 10.6, back in 2009. What I do need help in is booting up the Mac, as it fails to boot and has the same issue in both safe and normal mode.

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FYI: DSMOS stands for Don't Steal Mac OS

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That's quite confusing, considering the fact that all I did was update from 10.5 to 10.6. That was, I'm pretty sure, years before this issue began. Haven't done much to my Mac OS since then.

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One of the issues this older Mac Pro’s face is you need to use the original GPU card the system will recognize as the default board. As the update process needs it to ID the system.

The swapped out GPU is giving you a problem! You need to get a real Apple board to get the OS to install properly.

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Mhm... That may not be the case, I'm pretty sure I bought the Mac version of the 8800 GT, and the machine ran fine for quite a few months after that before the issue began to occur. Could anyone read the verbose output and tell me if there's any signs there? The OS was already installed when I bought the computer back in 2008, and it's been that way ever since apart from the upgrade to Snow Leopard.

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I already saw that video, I don't think it will be helpful in my case.

Mac OS 10.6 Snow Leopard was already installed on my Mac Pro back in 2009, and has been that way ever since.

I don't need help in installing the OS, that was already done a long time ago. What I do need help in is booting it, as I cannot boot in either safe or normal mode.

Some things worth noting: As seen in the verbose boot images, there are two lines which may be linked:

"Bug: launchctl.c:3557 (23930):17: loctl(s6, SIOCAIFADDR_IN6, &ifra6) != -1"

And

"launchctl: Please convert the following to launchd: /etc/mach_init.d/dashboardadvisoryd.plist"

I am certain there are clues in the verbose boot logs, it would be amazing if anyone was able to read what the verbose logs are indicating.

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Munir さん、ありがとうございました！
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