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iMac 12.1 mid 2011 black 21" screen problem

B

Borteck

macrumors newbie
Original poster
Apr 7, 2024
4
1
Hi Folks,
My iMac stopped working after changing the HDD to a new SSD. Reversing back to HDD doesn't change the problem.

The iMac is a 12.1 model from mid-2011 and when the start button is pressed, I can hear the DVD drive starting, the Apple shime,
the 4 green LEDs on the motherboard are turning on sequentially right to left. And the screen displays a lighted black screen but no Apple logo and then no boot at all. No keyboard classic touch works (R, C, PRAM reset,...)

I've tried another flat video cable : nothing
I've tried a thunderbolt 2 to HDMI adapter : nothing

Could you help me on this ?
Thanks
Arnie
 
Borteck said:
Hi Folks,
My iMac stopped working after changing the HDD to a new SSD. Reversing back to HDD doesn't change the problem.

The iMac is a 12.1 model from mid-2011 and when the start button is pressed, I can hear the DVD drive starting, the Apple shime,
the 4 green LEDs on the motherboard are turning on sequentially right to left. And the screen displays a lighted black screen but no Apple logo and then no boot at all. No keyboard classic touch works (R, C, PRAM reset,...)

I've tried another flat video cable : nothing
I've tried a thunderbolt 2 to HDMI adapter : nothing

Could you help me on this ?
Thanks
Arnie
Click to expand...
Dead GPU? :eek:
 
Borteck said:
My iMac stopped working after changing the HDD to a new SSD.
Click to expand...
Double-check all cable connections are seeded, including memory sticks. Still no luck with orig HDD installed, try replacing the PRAM battery.
 
Hi, cables double-checked, RAM double checked. PRAM battery changed but measured slightly under 2.8v.
Sounds like a dead GPU, no other track in mind...
 
Borteck said:
Hi, cables double-checked, RAM double checked. PRAM battery changed but measured slightly under 2.8v.
Sounds like a dead GPU, no other track in mind...
Click to expand...

If all your data have been saved, then remove the SSD and discard the iMac, unless you want to spend more money on a 12 year old dead computer, of which market value is 100$ or less. (an iMac 2011 21.5" is normally offered for 100$ or less where I live, in working condition)
 
Nguyen Duc Hieu said:
.... (an iMac 2011 21.5" is normally offered for 100$ or less where I live, in working condition)
Click to expand...
+1.

Bought one for $65 two weeks ago, working, no kb or mouse. Milwaukee, for reference. Not hard to find.
{An inexpensive DVD burner with firewire interface, replacing a 2006 Macbook as NAS/iTunes server}.
 
Nguyen Duc Hieu said:
If all your data have been saved, then remove the SSD and discard the iMac, unless you want to spend more money on a 12 year old dead computer, of which market value is 100$ or less. (an iMac 2011 21.5" is normally offered for 100$ or less where I live, in working condition)
Click to expand...
I just want to use it as an extra monitor. Do you know a good hack ?
 
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