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Question: iMac still getting black screen HELP!!!

Apple iMacå27” i7 2011 3.4 Ghz

Only 3 led lights will come on!

I put in new power supply!

I put in new backlight board!

I bought another monitor!

I got new 3 new ribbons.

Computer starts with external monitor works fine.

I while ago I put in monitor ribbon that has a pin missing it went black after a few minutes.

Since then the screen will not light up.

I tried everything I can think of…

Have you ever run into this or heard of this problem.

So I’m thinking it the old ribbon did something to the motherboard.

I took out motherboard it looks good no bulging capacitors or leaks but i did notice a little white residue on front of motherboard under 2 capacitors.

very little.

I’’m trying to fix this myself never done this before.

I have been working on it for months learning as I go…..

Any ideas.

I am really getting depressed over this.

I don’t have anymore money I live on fixed income.

This is the only computer I have.

I appreciate your interest I am not a technician DYI

In fact I’m using it with my tv monitor now!



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iMac, macOS Sierra (10.12.5)

Posted on


Nov 15, 2017 12:03 PM in response to hmaher777 In response to hmaher777

Unfortunately yours is a classic case of trying to save money and spending more due to lack of knowledge. I suggest taking the computer to your local AASP for a professional diagnosis and then you can decide what to do. If it's time to replace the computer consider an Apple refurbished computer or getting a used Mac from a reputable source such as OWC (www.macsales.com).

Good luck.

Nov 15, 2017 12:03 PM

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Question: iMac still getting black screen HELP!!!