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27"....2011..imac black screen
source link: https://forums.macrumors.com/threads/27-2011-imac-black-screen.2274294/
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27"....2011..imac black screen
Dec 1, 2020
replaced the gpu.
still no picture just black screen
make the apple chime..
can here cdrom going..
no backlight
cant seam to find a topic..
any help please...
still no picture just black screen
make the apple chime..
can here cdrom going..
no backlight
cant seam to find a topic..
any help please...
Unfortunately the 27" iMac's of that period are plagued with GPU problems.
When the problem first started did you see coloured pixalated lines across the screen or did the screen suddenly go blank?
From where did you get the replacement GPU? It's a known fact that there are many sellers advertising 'refurbished' GPU's that are problematic.
Or did your problem start after opening the iMac to change the HD or SSD? If that's the case you may have the display cable, power cable or backlight cable that is not firmly in position or perhaps even defective.
I have a similar problem on a mid-2010 27" iMac and plan to change the display cable.
When the problem first started did you see coloured pixalated lines across the screen or did the screen suddenly go blank?
From where did you get the replacement GPU? It's a known fact that there are many sellers advertising 'refurbished' GPU's that are problematic.
Or did your problem start after opening the iMac to change the HD or SSD? If that's the case you may have the display cable, power cable or backlight cable that is not firmly in position or perhaps even defective.
I have a similar problem on a mid-2010 27" iMac and plan to change the display cable.
Dec 1, 2020
took it to computer tech who said it was gpu..
got gpu from ebay.???
could be faulty..
any cheep replacements....thanks..
i have two...might change the screen see if it works...
got gpu from ebay.???
could be faulty..
any cheep replacements....thanks..
i have two...might change the screen see if it works...
Was it a computer tech who is very familiar with Mac's or a 'general' tech who's primary repairs are pc's? If the latter I'd say his diagnostics may be flawed.
It's no secret that even the AppleStore 'genius's will nine times out of ten suggest a logic board change on a laptop even when it's possibly something simple line a cable bad connection which only takes minutes to rectify.
The following is worth noting from the dedicated thread about 2009-2011 iMac gpu's:
Getting a 7-8 year old used Nvidia card may cause some new problems. These cards may be already (half) dead and the current owner knows exactly why he wants to sell the card after years. Do not jump into the first cheap deal, try to get unused spare parts. Most complaints on this thread (hundreds of posts) were caused by cheap old dead cards and endless trials to "repair" these by installing software. This will not work! Some Far East sellers offer new cards with new BIOS chips soldered on. Ignore those offers.
It's no secret that even the AppleStore 'genius's will nine times out of ten suggest a logic board change on a laptop even when it's possibly something simple line a cable bad connection which only takes minutes to rectify.
The following is worth noting from the dedicated thread about 2009-2011 iMac gpu's:
Getting a 7-8 year old used Nvidia card may cause some new problems. These cards may be already (half) dead and the current owner knows exactly why he wants to sell the card after years. Do not jump into the first cheap deal, try to get unused spare parts. Most complaints on this thread (hundreds of posts) were caused by cheap old dead cards and endless trials to "repair" these by installing software. This will not work! Some Far East sellers offer new cards with new BIOS chips soldered on. Ignore those offers.
Don't replace the GPU.replaced the gpu.
still no picture just black screen
make the apple chime..
can here cdrom going..
no backlight
cant seam to find a topic..
any help please...
Done.
USB3foriMac
macrumors regular
Apr 15, 2020
Not a great amount of detail that you provide here. What GPU? What was before? Why change? Who changed?replaced the gpu.
still no picture just black screen
make the apple chime..
can here cdrom going..
no backlight
cant seam to find a topic..
any help please...
As of now, it could be anything. So please be more precise.
BTW, there is a huge thread pretty much on top of the list about GPU on iMac 2011 and what to do if you change to different model.
Dec 1, 2020
was told the gpu had died.so i fitted a new one same...stock for 2011.. 27"..
still nothing..can i plug a second screen in to see if that works..if so how....got the thunderbolt to thunderbolt cable...pressed command..f2....nothing...thanks
still nothing..can i plug a second screen in to see if that works..if so how....got the thunderbolt to thunderbolt cable...pressed command..f2....nothing...thanks
Dec 1, 2020
dont replace the gpu..???Don't replace the GPU.
Done.
USB3foriMac
macrumors regular
Apr 15, 2020
1. Boot machine hold down Option key. Keep holding.told the gpu had died.so i fitted a new one same...stock for 2011.. 27"..
still nothing..can i plug a second screen in to see if that works..if so how....got the thunderbolt to thunderbolt cable...pressed command..f2....nothing...thanks
2. Confirm there is the Chime. If no Chime, your problem is PSU or GPU or logic board.
3. Wait another 20 seconds, then let go of the option key.
4. Take a strong torch light and shine onto the screen. Try to identify some icons around the center.
5. If you are able to see anything on the screen, your problem is neither GPU nor screen. The problem is related to backlight. This could be PSU, backlight circuit, cable connection or screen.
If you see nothing, your problem can be GPU or screen.
If you already tried another GPU, you could try external screen. Connect any screen eg. via mini Displayport to HDMI to a HDMI screen.
Alternatively, remove the screen, and observe the LEDs. Let us know what you see.
6. Make a boot stick of High Sierra, or use "Internet recovery". Read up on how to do this. Easy. You can install MacOS onto a thumbdrive, you should have one. Then at least you have a bootable system.
Dec 1, 2020
ok..thanks..did all that..has chime..
no icons using torch
made usb bootable high siera. nothing
cant get screen to work..thunderbolt to thunderbolt..or hdmi..
4 led lights..
first 2 green..other 2 black...nothing..
no icons using torch
made usb bootable high siera. nothing
cant get screen to work..thunderbolt to thunderbolt..or hdmi..
4 led lights..
first 2 green..other 2 black...nothing..
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