iMac 12.1 mid 2011 black 21" screen problem

[Borteck]

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

 

[K two]

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

Dead GPU?

 

[Bigwaff]

My iMac stopped working after changing the HDD to a new SSD.

Double-check all cable connections are seeded, including memory sticks. Still no luck with orig HDD installed, try replacing the PRAM battery.

 

[Borteck]

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...

 

[Nguyen Duc Hieu]

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...

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)

 

[franklynb]

.... (an iMac 2011 21.5" is normally offered for 100$ or less where I live, in working condition)

+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}.

 

[Borteck]

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)

I just want to use it as an extra monitor. Do you know a good hack ?

 

[Nguyen Duc Hieu]

I just want to use it as an extra monitor. Do you know a good hack ?

Are you willing to spend 30$ on a LCD driver kit?

21.63US $ |21.5'' iMac A1311 LM215WF3 (SD)(C2) LCD Controller Drive Board Monitor Display Kit For LM215WF3-SDC2 Screen Test Mainboard

Smarter Shopping, Better Living! Aliexpress.com

www.aliexpress.com

 

[Borteck]

Are you willing to spend 30$ on a LCD driver kit?

21.63US $ |21.5'' iMac A1311 LM215WF3 (SD)(C2) LCD Controller Drive Board Monitor Display Kit For LM215WF3-SDC2 Screen Test Mainboard

Smarter Shopping, Better Living! Aliexpress.com

www.aliexpress.com

Thanks, I'll look that. 1st I tried to "bake" it 6min at 260°C, I'll test it tonight. Several tiny solder balls exit around the GPU chip. Clearly solder paste in excess !