So I just replaced the SuperDrive with that HDD Sata III Adapter (with the HDD of course) and my MBP doesn´t turn on anymore.

Just a plain blackscreen, the fan does not work and there is no boot sound either.

I already tried to unplug the battery for a several hours and plug it back in. Nothing.

Tried to start with the magsafe and unplugged battery. Nothing.

Also tried a SMC Bypass. The fan is working but nothing else is.

The magsafe lights up in green when I plug it in. With or without connecting the battery.

Although the MBP doesn´t start up I hear a little noise when I press the power button.

Also I should mention that I connected an usb-stick before the first boot after I finished the SuperDrive replacement.

On the first boot (not a SMC Bypass) the fan worked but the screen was black.

Hope that anyone can help me.

Thanks in advance.

Greetings,

Steven

Can´t seem to find any missing component here. Battery is unplugged on purpose.

Edit: Found out that the little noise comes from the SSD (SuperDrive + SSD constellation).

When I take the SSD out and press the power button I hear only hear a tiny click or crack.

So, out of curiosity and mainly despair I removed the logic board and looked on the back of it to see, if there are any burned or suspicious areas.

Maybe one of you sees anything...