MacBook only boots fully occasionally, otherwise black screen
Hi! I've got a MacBook which boots and works fine about 1 in 30 times I try to power it on, and the other 29 it makes bootup noises (but no chime), the optical drive revs up, the power light stays on, but nothing else happens. When it works occasionally, it works 100%, and stays on pretty much till I power off. The original owner was told by Apple that it's a GPU problem. I've tried different memory, replacing the DC-in, PMU and PRAM resets, and nothing seems to make a difference or improve the 1/30 ratio. I don't suspect the screen, because, again, when it works, it works. I'm just curious if anyone has any thoughts before I give up and assume it's a bad board.
If you want to see the machine, below is the video I'm using to sell it on EBay. I've been selling lots of MacBooks for parts lately, and would much prefer to sell this as a working machine! :-)
좋은 질문 입니까?
Thanks guys! Today I replaced the screen and hinge, just to rule that out, and unfortunately it still exhibited the same symptoms. There was a moment of excitement when it seemed a new topcase had solved the issue, but, alas, the problem started happening again.
Ah well, sometimes a bad motherboard is just a bad motherboard, and there's no other way about it, and the productive thing to do is just move on. It's frustrating though, when a machine like this one seems so close to being fixed!
Have you tried booting without the optical drive connected, or to an external drive with bootable OS?