Model A1311 / Mid 2011 / 2.5 & 2.7 GHz Core i5 or 2.8 GHz Core i7 Processor

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No Display after SSD Install but 4 Diagnostic lights are on.

Hello,

I just installed an SSD but now there's no display at all. I can hear my fans and the startup chime and all 4 diagnostic lights are on.

I've saw other similar issues but none with all 4 lights on.

Hopefully someone can help.

Answered! View the answer I have this problem too

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Check your vertical sync cable is it damaged or not correctly plugged in as well as the backlight poet cable? Review Steps 5 & 6 in this IFIXIT guide: iMac Intel 21.5" EMC 2428 Display Replacement.

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