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Apple Computing Products:
macOS - Desktop Hardware
Help my iMac Intel HD issues!
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<blockquote data-quote="cwa107" data-source="post: 1348082" data-attributes="member: 24098"><p>Although I've yet to experience this issue with the Mac's EFI, working in IT for the better part of 15 years now professionally, I have run into a number of occasions where BIOS wouldn't complete POST with a severely screwed up HD on the IDE/SATA bus. If I'm not mistaken, many modern BIOS will run a scan of the bus during POST as well as SMART tests (if enabled) and can hang if the drive's own firmware doesn't respond to the query as expected.</p><p></p><p>I suspect that's what's going on here. EFI is probably querying for status on the SATA bus and hanging when not getting the expected feedback. I'll bet if you pull that drive off the chain, it will go right through and allow you to access the boot manager.</p></blockquote><p></p>
[QUOTE="cwa107, post: 1348082, member: 24098"] Although I've yet to experience this issue with the Mac's EFI, working in IT for the better part of 15 years now professionally, I have run into a number of occasions where BIOS wouldn't complete POST with a severely screwed up HD on the IDE/SATA bus. If I'm not mistaken, many modern BIOS will run a scan of the bus during POST as well as SMART tests (if enabled) and can hang if the drive's own firmware doesn't respond to the query as expected. I suspect that's what's going on here. EFI is probably querying for status on the SATA bus and hanging when not getting the expected feedback. I'll bet if you pull that drive off the chain, it will go right through and allow you to access the boot manager. [/QUOTE]
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Apple Computing Products:
macOS - Desktop Hardware
Help my iMac Intel HD issues!
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