4th let does not light up

Question

iMac Intel 21.5" EMC 2638 & EMC 2742 Late 2013

Model A1418 / Late 2013 / 2.7 & 2.9 GHz Core i5 or 3.1 GHz Core i7 Processor

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Hi

I change the hard disk of my Imac

then I reassembled it, but the screen didnt turn on but when i pluged and external monitor it worked fine

i searched a bit on the web i found out about the 4 diag LEDs when i checked my MoBo only the bottom 3 LED work then top one doesnt light up

i though maybe i ripped the screen ribbon so i replaced it with other one but still the same problem

这是一个好问题吗？

是否

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score 2 · Answer 1 · 2016-10-22T07:05:36-07:00

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First hook it up to an external monitor to verify the GPU.

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是否

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I forgot to mention that

I already use the display port and it's OK.