It starts, works and then restarts by itself.

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iMac Intel 20" EMC 2133 and 2210

Model A1224 / Mid 2007 and Early 2008 / 2, 2.4, or 2.66 GHz Core 2 Duo processor

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Antonino Auteri @antoninoauteri

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发帖于: 2021年8月7日

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It starts, works and then restarts by itself.

I got this iMac (EMC 2133) that has been standing for 4 years in a box. Virtually new. I didn't remember any particular problems, but I decided to format it and update it to use it a little… surprise .. I format, I start the installation and it starts to reboot in a convulsive manner. I thought the pendrive was bad, and I used the original Mac OS X Leopard disks… it seemed to work, and then it restarted for no reason.

Now I decided to open it and in the end I said to myself, let's have a clean, CPU / GPU paste change doesn't hurt, and a quick check on the battery (it was at 2.90v) and capacitors ...

I'm sure I haven't solved anything, and I've started writing here.

The capacitors all seem ok, but I'm not 100% sure ... I ask for advice and help ...

In the end, I substituted the thermally conductive paste on:

CPU / GPU / Chipset / Power supply diode bridge (which was detached from its cooling fin).

I kept the battery unplugged for a few hours, and to be honest I put the same back. I keep it in test for a couple of days and see what it does, otherwise I change it.

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Dan @danj

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发帖于: 2021年8月8日

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You are likely hitting a few different issues!

First having the system tucked away for so long likely has a dead PRAM battery as the battery is not designed to support the system that long without being plugged in iMac Intel 20" EMC 2133 and 2210 PRAM Battery Replacement

What is the OS version you are trying to install? The highest version your system will support is El Capitan (OS-X 10.11.x)

As far as rebooting during the OS install process your system may do that as your systems firmware is often also updated depending what it was running. You also have a newer file system (HFS to HFS+) which could also be a factor.

You also could be facing an issue with your power supply! Capacitor Plague So you may need either a new power supply with the better caps or will need to replace the electrolytic capacitors if they show signs of failing.

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That's an interesting link about the capacitor plague, Dan. Wonder is it the same or similar that afflicted the earlier Time Capsules...

由 Guy Hemmings 完成的 2021年8月8日

@paddymacman - the very first unit came out in 2008. The plague issue ended in 2007. Most of the TimeCapsules I saw had dead drives as the systems cooing was flawed!

由 Dan 完成的 2021年8月8日

@danj Thanks for the tips.

The capacitors, on this iMac 20 inch, had no problems. I had problems with the ones on my 24 inch iMac (same year) that I use every day (they exploded, and I had problems on the 12V) one fine day the HDD started tapping on boot, I opened everything, and on an external box it was perfectly fine ... first checked the voltages and then I ordered the capacitors running, which were almost all exploded.

I forgot, back to this iMac and your question, I was trying to install El Capitan, then after the first problems I installed Leopard from the DVDs that Apple provided with the iMac. After an Update, it started rebooting again ... and from there I went crazy ...

Now I'm also trying to keep it disconnected from the mains, after a day of CPU stress test where everything went perfectly.

P.s .:

If I change the BR2032 for a CR2032 (it's easier to find), it shouldn't change much apart from the self-discharge of the battery right?

由 Antonino Auteri 完成的 2021年8月8日

@Antonino Auteri - Using the BR2032 should be OK

由 Dan 完成的 2021年8月8日

@danj thanks again for the answers and suggestions.

由 Antonino Auteri 完成的 2021年8月11日

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That's an interesting link about the capacitor plague, Dan. Wonder is it the same or similar that afflicted the earlier Time Capsules... — Guy Hemmings
@paddymacman - the very first unit came out in 2008. The plague issue ended in 2007. Most of the TimeCapsules I saw had dead drives as the systems cooing was flawed! — Dan
@danj Thanks for the tips.

The capacitors, on this iMac 20 inch, had no problems. I had problems with the ones on my 24 inch iMac (same year) that I use every day (they exploded, and I had problems on the 12V) one fine day the HDD started tapping on boot, I opened everything, and on an external box it was perfectly fine ... first checked the voltages and then I ordered the capacitors running, which were almost all exploded.

I forgot, back to this iMac and your question, I was trying to install El Capitan, then after the first problems I installed Leopard from the DVDs that Apple provided with the iMac. After an Update, it started rebooting again ... and from there I went crazy ...

Now I'm also trying to keep it disconnected from the mains, after a day of CPU stress test where everything went perfectly.

P.s .:

If I change the BR2032 for a CR2032 (it's easier to find), it shouldn't change much apart from the self-discharge of the battery right? — Antonino Auteri

iMac Intel 20" EMC 2133 and 2210

It starts, works and then restarts by itself.

Update (08/08/2021)

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