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

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Black screen on start up diognostics "help".

Here is a walk through of what I have already done. 1: noticed I only had one led light on when start I start it up. 2nd I took it to a Imac certified technician for diagnostics. 3rd: found that my rear ram banks were bad and the front two worked. 4th: found that my graphics card was bad. 5th: due to bad graphics card further diognistics could not be done. 6th: with ram in the right spot and the graphics card out I get led diognostics lights one, and two on when I start up. 7th: found a working graphics card. 8th: with new card in and all put back together I get all four lights on butt still black screen. 9th: I purchased a thunderbolt cable and hooked it up to my tv via hdmi cable, and got nothing. 10th: since I got no video on the tv I switched out the backlight board with a different one. 11th plugged everything back up and valla! I got a blue screen. Things to note:. I have a new unformatted ssd drive in place of the old one. I get chimes and everything seams to start up normally. I have reset the pram.

Question: my lcd display looks good. Have these gone bad before? I have 2 of them here and neither one works. What are my possible solutions? New question: do I kneed a start up disc to format and install the OS? If not how do I do in?

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First, to help isolate the problem, hook it up to an external monitor to see if the GPU is putting out a signal. When trouble shooting issues it's best not to do upgrades. If the old drive was working, put it back in. Handle the SSD upgrade AFTER you have the machine running. Recheck your connections to the LED driver board: iMac Intel 27" EMC 2309 and 2374 LED Driver Board Replacement

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Ok all I have is a g5 imac and a plasma television system. Can I hook it to one of thoes? Also I bought this broken imac from eBay so I don't have an original working hardrive other then the one that is in my g5.

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Awesome good news I hooked up the mac to my tv via thunderbolt cable/hdmi hookup and I got nothing. So next thing I did was swap out the back light board with another I had laying around and walla I got a blue screen. Next step I think is formatting the hard drive. I don't have a install disc so I guess I will have to get one of those. Our is there a way to install the Mac OS without a startup disc?

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