Only boots when power button is held down; strange behavior
Hi everyone,
Any suggestions you have would be greatly appreciated! Here's the situation:
I just got my hands on a 2012 Macbook Pro 15". I got it pretty cheap because the seller said the computer wouldn't get past the grey screen or Apple logo when booting. I figured it was likely an issue with the hard drive and bought it anyway. Sure enough, when I put my own hard drive in there, the computer doesn't get stuck on the boot screen.
HOWEVER, it will only turn on if I hold the power button down until I hear the click/whirr of the CD drive. If I just press the button, the SIL will turn on once and then nothing. I don't think there are any mechanical noises when this happens.
Once on, the computer appears to work fine. It's a little sluggish to boot and to respond to inputs, but that could be because of the 8 year-old HDD running High Sierra (just as a tester), or because the OS was installed on an entirely different machine (2010 13" MBP, 2.4 GHz C2D).
Thanks for your input!
EDIT:
I've reset the PRAM/NVRAM and tried resetting the SMC, but I couldn't tell if anything happened.
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2 件のコメント
I would try to do a fresh install of the OS, and see if that helps. This does seem like its an EFI firmware issue. perhaps updating that might help the situation?
Maharaja さんによる
Open up Activity Monitor and see how much of the cpu is being consumed. If you have the kernel_task process consuming >300% of processor, then it surely is a thermal sensor problem, like my MBP suffered just this week.
I would also suspect some power issue. If it turns on holding the button for 10 seconds, then you could perform a power cycle and see if that normalises things back.
Shivendra Sharma さんによる