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MacBook boot not working, fans active

Hi all,

I have an old broken MacBook here. When I hold down the power button I do here the fans starting to turn, the hard disk unlock (or at least some sounds) like it's booting up but the screen stays black, I cant eject a disk, the shift key light can't be turned on and no boot sounds is heard. After 10 seconds the sounds die down and goes to a minimal fan speed like it's on sleep.

I've tried to boot it while holding shift and also the PRAM reset (option, cmd, p and r).

Any ideas what could fix this? Is it a common problem? Something seems to work still so I have hopes of fixing it.

Thanks!

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Can you give us a history on the machine with emphasis on any video issues or screen artifacts?

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@Mayer Thanks for you reply. There isn't any history of repair or previous problems. It was put into sleep in the evening and the morning after the problems started.

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0.0001% chance it is RAM, 99.9999% chance dead GPU. If this is NVIDIA replace with G84-603-A2, 128 bit, NOT cheap 64 bit remarked junk. If this is X1600 based just toss it in a bin there are no new chips for those and the old VRAM dies when you heat the board to replace the chip.

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