Fix Your Stuff Community Store

Model A1225 / Early 2009 / 2.66, 2.93, or 3.06 GHz Core 2 Duo processor

164 Questions View all

Options

Computer shuts off after a few minutes of use

Hi,

My iMac (early 2009, 24") started shutting down after a few minutes of use. It's not a clean shut down. It's an instant cut-off of power.

Using Hardware Monitor, everything looks normal except with the Northbridge...

- The voltage sensor always shows 0 volts.

- The current shows 0 as well.

I've tried resetting NVRAM and SMC, but that hasn't helped.

Does anybody have any advise before I replace the system board?

Thanks,

Jay

Answer this question I have this problem too

Is this a good question?

Yes No
Score -1
Add a comment

2 Answers

Filter by:
Most Helpful Newest Oldest
Most Helpful Answer

Options

if you haven't already i would try cleaning the dust out, make sure the fan is still spinning, it sounds like a possible overheating issue

Was this answer helpful?

Yes No
Score 1

1 Comment:

Thanks Michael.

Overheating was the first thing I thought of. I tried all you suggested.

I also tried using smcFanControl to increase the fan speeds. I replaced the thermal compound on the Northbridge as it was running a little hot (about 75 degrees C at idle). It now runs about 5 - 10 degrees cooler. Everything else seems to be running cool.

So far, nothing has helped.

by

Add a comment

Options

Best to take the frame off and take a look at the diagnostic lights when it goes down. That will tell us where to look.

Was this answer helpful?

Yes No
Score 1

1 Comment:

Thanks Mayer. I did that too. It goes directly from 4 lights to 2. Unfortunately that doesn't help.

by

Add a comment

Add your answer

Jay Thomas will be eternally grateful.
View Statistics:

Past 24 Hours: 0

Past 7 Days: 5

Past 30 Days: 10

All Time: 303