2.2 GHz (Turbo Boost使用時最大3.4 GHz), 2.5 GHz (Turbo Boost使用時最大3.7 GHz)もしくは2.8 GHz (Turbo Boost使用時最大4.0 GHz) L3キャッシュで6 MBのクアッドコアIntel Core i7プロセッサ

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Starting up only gives me a partial boing, does not start up.

Hello,

Starting my MacBook Pro only produces a partial boing, which is repeated after a few seconds over and over again. Meanwhile nothing appears on the screen, it stays black.

It's no different whether I try to start from battery power of from AC power.

Connecting the power adapter gives me, at first a green light, which turns to orange after a few seconds.

What might cause this problem? It was working fine until a few days ago and then suddenly this situation appeared !

Thanks for any suggestions and kind regards.

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Lets dig a bit deeper here... You'll need to open the system up and do a detailed inspection looking for any signs of liquid damage or damaged components on both sides of the logic board. If you do see something take a picture and post it here for us to see. Here's the IFIXIT guide you'll need to follow: MacBook Pro 15'' Retina Display Mid 2015のロジックボードの交換. I'll admit there is a lot of stuff to take off but it's not hard.

If you don't see anything put the system back together, then lets try leaving the battery disconnected to see what the system does with the MagSafe connected. Did it react any differently when you started?

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I already had a look at the logic board and could not detect any damages of any kind.

As you suggested, I disconnected the battery but starting up gave me the same result as with the battery connected. I also noticed that the light on the adapter was green and then switched to orange as it did with the battery connected

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You looked on both sides?? The chips I'm suspecting are on the back side.

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Can you tell me where to look exactly please. Damage on the logic board can be practically invisible if you don't know where to look for it. Thanks.

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Well most of the time we see some damage or a bad solder joint. Surprisingly your board looks OK.

After you've put your system back together. Leave the SSD disconnected. When you start up this time are you getting to a missing system icon (blinking question mark in a folder)?

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I left the SSD out and started up with the same result as before, a partial boing which is then repeated endlessly.

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Bisshop Jyr さん、ありがとうございました!
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