I took my iMac in to the local Genius Bar on Saturday. It no longer boots, and I was having display problems before the “won’t boot” condition occurred. I’d looked into the display problems, and they were apparently caused by overheating damaging the RAM chips on the logic board. Presumably, leaving my system on for long periods (among other things, I used it as the main server on my home network) was what led to the problems.
The RAM can’t be replaced, of course, so I presumed repair would require a new logic board, and I wanted to find out just how much that would cost.
Well, the tech at the Genius Bar did get it to boot a couple of times, and the sensor diagnostics indicated no overheating problems. Trying to run some of his other tests didn’t work, though, and he couldn’t boot/run the more in-depth tests that may have isolated the problems. Therefore, replacing the main logic board is the minimum that seems necessary to get the system running again. Unfortunately, my iMac is a “late 2006″ model, and Apple no longer manufactures replacement parts for it. If I want it fixed, I have to go to an aftermarket repair facility. Looking on line, used logic boards run about $500, and labor charges can only add to that.
The tech at the Genius Bar suggested that my best course of action with the old iMac would be to sell it to one of the local aftermarket repair facilities for parts, because there’s still a demand for iMacs like mine. I imagine I’ll end up doing that. Although my company did send me for training in surface-mount soldering last year, I have no way of determining what to replace to solve the problems, and scattershot replacing of parts is likely to be expensive, with no guarantee of success.
For a system with 1GB of RAM and a 250GB hard drive, that’s not worth it to me. A new iMac runs about $1100 for the low-end model, which would give me a system with better display, 8GB of RAM, and 1TB of hard disk. I’m not sure I’ll do that, though. I have a “late 2011″ MacBook Pro I’ve upgraded to its maximum RAM capacity and a large flash drive that serves most of my needs quite well, so I can get by for the foreseeable future without buying anything new. For file server purposes, I may see how well my Beaglebone Black works.