Imac 27" startup problem

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Hello everyone,I have a problem with my Imac and before to do anything I want to show you it.I've posted a video on youtube at this address: https://www.youtube.com/watch?v=bOxXPTxavqM
Thank you all for any suggestion.
 

bobtomay

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Your Mac's Specs
15" MBP '06 2.33 C2D 4GB 10.7; 13" MBA '14 1.8 i7 8GB 10.11; 21" iMac '13 2.9 i5 8GB 10.11; 6S
Have you changed out the RAM in it?
 
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I've changed the RAM for first thing but nothing... the startup tones indicate the RAM in fact.
I would to check the voltages of power supply but I don't have a pinout.
At last trying with the reflow of CPU or GPU.

(I've sent the mac to the technical service but they told me I must change all the logic board) :(
 

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