question iMac i7 to power 2011

Greetings,

I think I'm having an interesting eating problem and I hope that someone with an Apple hardware experience could read this before blindly, I replace the power supply (and spend money, I don't).

I have a 2011 27 "iMac12, 2. Model A1312 EMC No. 2429, iMac Core i7 3.4 GHz. 12 GB of memory running 10.9.5 with the latest updates. 8 GB of third party RAM and an SSD of third with OWC temperature sensor cable. Fans will work perfectly and normally respond with this SSD and cable.

This is a long post, but I think I describe an interesting problem. So read on if you want. Otherwise - thanks anyway.

I am an electronics engineer and use Macs for a long time. But don't have the inside scoop and experience with the power of the iMac and logic boards, maybe an Apple technician will see this and be able to answer a few questions I have.

This computer has been great for years of work but began acting strangely in the last week. I noticed that he wouldn't wake up from his sleep, and then I noticed during active use would block after about 45 minutes or an hour or two.

Sometimes, I'd get the (pizza wheel) spinning wait cursor when in the finder, then for each open application that I would try to activate it once that this started happening I couldn't recover from it. The box to force out would not come to the top. Only a (switch) forced shutdown and restart would bring the computer to life.

When the problem occurs, I'd get the spinning wait cursor, no response from the keyboard. Windows remains visible on the screen can be moved, but otherwise don't would not respond and applications would hang.

When you run properly, the OS and applications behave normally and appear to be catchy as ever.

I did a lot of troubleshooting. It felt like a problem of material for me.

I first turned off the Bluetooth, then removed all external devices and connected a wired keyboard and mouse. The problem occurs when you are logged in different user accounts and not appear related to a specific application. When she fails the computer stops responding on the network as well.

I started in safe mode which did not help.

I ran after each failed disk utility and reboot. The third internal SSD seems fine and passes check and permissions check every time.

I did a virus scan. No detection.

I ran the diagnostics of material. Usually happened, he only missed once during the test expanded memory after an hour. I then removed the 8 GB of RAM third leaving only the original Apple 4 GB of RAM installed. The successful test material. Sounds like bad RAM?

No, Frost continues with only the Apple installed memory. I think the hardware test failed, because the power supply problem would happen after a time anyway.

I turned off the screen saver and sleep so I could see the contents of the screen when it failed and during that time, tried to use the machine for a normal job. I have to prepare taxes and screen 27 "is very useful at the time so I can open lots of windows. But the computer crashes as I get into my work.

Finally, I pulled my copy of HardWare monitor (v4.99) and noted the various sensors. I noticed that the voltage sensor shows two voltages, 12 volts for the MXM graphics module which seems stable and right around 12 volts.

The other specified voltage is the provision of CPU. I guess this is supposed to be 1.2 volts. But it varies - much.

The offer varies 1.2 Volt to as low as 0.87 volts. It must be the way out of the standard if it is supposed to be a supply of 1.2 volt.

So the first question, is that really supposed to be 1.2 volt? I don't know about you, but this makes sense to me.

Then the provision of 1.2 volt regulated on the power Board or regulated on the logic board? In other words, replacing the power supply would be an interesting test?

But here's the interesting part: the voltage INCREASES to 1.2 volts and becomes stable if I give compliant to do computing. I started to run the chess playing program computer vs computer. The tension immediately stabilized at 1.2 volts and looked good! I was expecting to fall!

Who knows what is happening with this switching power supply? The increase in workload may actually it wrong in appropriate regulations. That being the case, I'll keep the computer play chess in the background while I work on my taxes that I monitor the voltage and see if this prevents crashes until I can replace the power supply, or something else.

Thanks for reading.

Greetings,

I solved this problem. It was pretty weird. On the way, I discovered that it is normal that the voltage of the CPU has to vary, it is a feature of the processor Intel 2600 for energy savings. I discovered that gel that happened exactly one hour after re-powered to the top of my iMac. Exactly. It was too weird. It turns out that my Crucial SSD drive has a bug in the firmware that comes after 5200 hours of operation and then every hour thereafter, requiring a power cycle to get it going again. The problem is described here. I'll replace the SSD with a larger (from another manufacturer!) rather than trying to update its firmware.

Tags: Mac

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question iMac i7 to power 2011

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