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Lançado em junho de 2012, modelo A1278. Processador Intel com Turbo Boost, até 512 MB DDR5 de RAM vídeo

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MacBook Pro mid 2012 wont boot at all

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Hello guys i bought a macbook pro mid 2012 on ebuy and the seller said the only thing which is broken would be the hdd cable. so i bought a new one and replaced it with ifixit.

After plugin everything in again the macbook wont boot at all.

The only thing it does it spinning up the fan for a moment and the cd drive makes some noises.

I tried to test if its the ram but this had no results.

So i holded down the power button 10 sec but it doesnt change anything.

The speaker also makes no noises to indicate a problem.

Any hints or tips would be really appreciated.

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There's... no hard drive.

Doesn't look like there's one present.

Have you tried sticking one in that has a compatible version of macOS installed?

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I thought it would also boot without harddrive to see if it’s even working.

The seller sold it without harddrive and i ordered a ssd to install MacOS through a usb Stick it.

are you sure the Hard Drive is nessecary for a boot?

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Even without a drive installed you should get some display response: If your Mac doesn't start up all the way Are you even seeing the display alter its grey color from one shade to another? Does the display have a glow (backlight working)?

At this point I would try launching one of the EFI (BIOS) utilities. Restart your system and this time hold the T key do you see a large FireWire or Thunderbolt icon floating on the screen?

If you don’t get any response this doesn’t look good ;-{

Reference: Mac startup key combinations

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Yea sadly the screen wont light up even a bit.

i guess its a dead logic board sadly :(

but thank you for your help

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