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iMac Intel 27" EMC 2309 (Late 2009, Core 2 Duo 3.06 or 3.33 GHz) ID iMac10,1, EMC 2374 (Late 2009, Core i5 2.66 GHz or Core i7 2.8 GHz) ID iMac11,1

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iMac27 crashes to black screen, fans running, won't boot for a day

Hi there,

i've got an late 2009 27'' iMac (Core 2 Duo).

Recently it started to crash to a black screen, after that the fans are still running (like normal, not loud etc.) in the back, but it's not just the screen that crashes or turns off, there is no sound and the Mac disappears from the network. I have to do a hard shutdown to power the Mac off.

When i try to power it back on right away, it will not boot (black screen right from the start or before the OS is booted). I can unplug the Mac and plug it back on, but it won't boot anyway.

When i wait for about 24h or so (completely unplugged) it will boot up just fine and work correctly for days / weeks ... until the next crash.

I tried reinstalling the OS several times, it even crashes while installing the new OS, i tried NVRAM / PRAM / SMC etc. and of course also fixing the file permissions and checking the disk. Everything seems alright from the software-side.

Does anyone have an idea or have you seen this behavior before?

Could it be the Power Supply being defective or could it even be the Logic Board?

Thanks in advance for your help, it's really appreciated!

Beantwoord! Bekijk het antwoord Dit probleem heb ik ook

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I have the same problem iMac 27" i7 late 2009.

It works fine from external screen.

It happened since upgrade to Lion.

The problem seems pre OS as it can happen when the loading screen is on.

It seems like a dodgy driver or firmware.

Did you get it resolved ?

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our late 2009 Mac 27" has just started this nonsense, but for us it happens when our iPhone 4S's are plugged in. I am going to try and switch USB ports and syncing cables. will let you all know how it pans out.

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You will need to take the screen and frame off to see the diagnostic LEDs to the right of the RAM slots. This will help tell us which part of the system is failing.

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Help Me Also Mr.Mayer Please,iam using imac mid 2009 mode it doesnt power on only fan running

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@imacmid2009 Please start a new question and give us your specifics and what your diagnostic LEDs are showing you.

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Is the iMac plugged into an outlet with good grounding, or is it plugged into a 2-prong outlet with an adapter? If the computer doesn't have a good connection to ground, static electricity can build up in the system to the point where the monitor stops syncing correctly. The fact that unplugging the computer for 24 hours eliminates the symptom for awhile supports that idea; letting the computer sit unpowered gives the capacitors time to bleed off the stored static charge.

If the iMac is plugged into a grounded power strip or surge protector, check to confirm that the power strip has a solid ground connection at the wall outlet.

Get a ground checker at Radio Shack or a hardware store, and confirm that your iMac is plugged into a true grounded outlet. You can also take your iMac to a location with a confirmed grounded outlet, plug it in and see if the problem recurs.

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Hey Adlerpe ur right ,my house dont have grounding,i have imac mid 2009 model it doesnt poweron only fan running pls help me

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If the fan is running, then the computer is drawing power. Typically, if it's a ground fault problem, then the device won't power up at all until the static charge drains out of the power supply's capacitors; this can take as long as a day powered off.

The real check is to take the computer and try it on a real grounded outlet. If you plug it into a known-good grounded outlet, and it powers up normally, then the problem at your house may be lack of grounding. If you get the same results plugged into a known-good grounded outlet, then power-up problem is likely to be something else.

Did the computer start normally before, when you were plugged into the non-grounded outlet?

As mayer says, your issues will be a lot easier for us to answer if you start your own new question, and give the details about your iMac/operating system/symptoms.

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iMac 27 2.93 i7, 16GB ram. Screen goes black randomly after Lion upgrade 10.7.3.

This issue just started for us about a week ago, and i finally found a quick solution to avoid a restart after a blackout.

When it goes black the CPU and system is still running, but can't do anything without force restart. Mirrored monitor stays on and i can work, but its a pain. The blackout is intermittent and i can't recreate the issue. Have restarted, Reset PRAM, SMC, prefs, privledges...everything.

This worked for me to get the screen to come back on without restart:

Shift+Control+Eject key. This forces the system to switch back to the inegrated graphics and not the nvidia drivers, which is causing the blackout.

http://reviews.cnet.com/8301-13727_7...c...

This fix has worked about 10 times now. Hope this is addressed soon by Apple, it's got to be a hardware issue!

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Mid-2007 iMac 27” running El Capitan. Started going to black screen but running. Tried all the start-up options holding various key combinations to no avail. Would run for about 10 minutes then black screen. Had to hard reboot each time. Read something about SMC Fan Control. Downloaded it and could see the temp was running quite high. Adjusted the options for the three controllers and fans to set the fan speed at its highest. Of course now it’s quite loud but not bad. Anyway, it fixed it. The machine was just getting too hot and shutting the display off. Have been running the machine with fans on high now for past 24 hours and no black screens. Get the app! It’s free but provides for donations. Gave them $12 this morning for it. Support your local developers :-)

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Coma zal eeuwig dankbaar zijn.
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