Won't ever finish booting; logic board replacement?
Anyone ever replace a logic board in one of these babies? Is the part even available??
Thanks everyone, especially @danj. I'm going to urge my client to get a new machine, as fixing this one is just too problematic for a 12+ year old iMac!
Okay, so it turns out the client bought a new graphics card for this machine, and wants me to install it. Have any of you ever attempted this install, and if so, would you recommend I give it a try??
(Let me know if it would be better if I started a new thread on this.)
Es esta una buena pregunta?
Unless it came from another iMac the MXM boards firmware will need to be updated which is a bit of a process. If it’s the same version then you can swap out the EEROM chip but you do need good soldering skills. Otherwise, you’ll need to copy the firmware off the dead board to then burn onto the new board (if different you’ll need to get the correct image from someone). If it’s not the same you may have issues with the heat sink fitting.
Even still what is this persons plans? Oftentimes they pushed the system to far with their workflow. Even I’ve done that three times! On my fourth board now and only write on it as much more will kill it again.
So consider your skills and time this will take to get working, also do you have the needed tools and lastly what if the board is not good either or won’t work as it’s not the correct board.
Saying no is not a bad thing if you have other work which is more profitable.
This system is on the edge of being useful with what people are expecting. So after getting it to work how long will it last?
- de Dan
Thanks (once again) @danj! I got an email saying you'd mentioned me in a comment suggesting I try Target Disk Mode to bypass the discreet graphics card, but I'm not seeing that comment here anywhere. Anyway, I tried it, and yes, the usual symbols show up on the screen. What does that tell us?
Your comments above are very helpful as well, particularly about the firmware issues. It really sounds more and more like this is a futile exercise!
- de jiclark
Try to put it into Target Disk Mode and find the Kext for the dedicated GPU and delete it, as this will make the Imac fallback into the intel GPU on the CPU
- de Thing
@macdoktor - look under Sqwerks comments as I posted that part there.
- de Dan
@thing - testing under Target Disk Mode will prove if the GPU board is bad or not. TDM uses the CPU’s integrated graphics to work which is why it’s a good test to isolate things.
Sadly, the IG services aren’t very good in this series if you are doing anything intense.
- de Dan
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