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Deleted MacOS partitions and installed Ubuntu, ...
The particular sequence likely wiped the recovery partition.
Unfortunately, partitioning and repartitioning is a common way of clobbering a system, whether unintentionally due to command errors or due to incompatibilities in the partitioning tools or due to bugs in the tools used.
Here, if neither Option-Command-R nor Shift-Option-Command-R will summon Internet Recovery, then it would appear that the (unspecified) model of Mac is an older or a down-revision one and that lacks the Internet recovery capabilities.
Apple has an archived article with a list of the older Mac systems that can be upgraded for Internet recovery, though that firmware update assumes macOS is already installed and running.
I would not expect Internet Recovery to be available in this particular case, however. From another posting of this question, this is likely a MacBook (13" Late 2009) model, and this MacBook predates Internet Recovery support, as was mentioned in a reply to that other posting.
With or without Internet Recovery support in any particular Mac, one of the common approaches for recovering from a wiped or corrupted disk involves the use of a bootable USB device, and select and boot from that. If that's not available here, a second Mac can be used to build that device. Another option is a visit to the local Apple Reseller or Apple Genius Bar, and ask for assistance in reloading macOS. Given this particular Mac appears to be old enough to have a DVD reader, it's also possible to acquire a DVD with Snow Leopard — that's the version that the MacBook (13" Late 2009) shipped with — and use that for the initial reload and then upgrade from Snow Leopard, assuming that the DVD drive works. Not all of those old DVD drives do still work, though. An external DVD drive can also usually be used, if one of those is available. If called, the folks at Apple Support might be willing to send along a free DVD, too. (The DVD is the official path for installing on older Mac systems; on the systems that predated Internet support.) Hi, thanks for replying. Yes, that stackoverflow post is mine, I'm pretty sure I used internet recovery before in that machine, but even if I'm wrong, both Option-Command-R nor Shift-Option-Command-R key combinations do affect the startup process, I.E. the computer does recognize that particular key combinations at startup, but they just end up loading either the GRUB boot loader or ubuntu itself.
I'd even try unplugging the HD and using another one, but I have the impression that the problem is in the UEFI, which I don't know much about but it seems to be in the motherboard and not in the HD, so I guess changing HDs won't help at all. I'm assuming the startup chime is sounding; that the boot-time hardware diagnostics are passing.
If none of the documented methods work, and if the USB device is visible at boot on the other system, and if the DVD is readable elsewhere, and if the SMC and NVRAM/PRAM reset fails to resolve this, then it would seem that something in the MacBook firmware has been well and truly corrupted. As you suspect.
The second-to-last remaining option is Target Disk Mode from another FireWire-compatible Mac (or the somewhat-more-effort disk swap), and then it's a trip into Apple or other service provider for a look at the hardware.
If the firmware is corrupted beyond the above reset sequences, there's no good recovery path, and there's no firmware download listed for the MacBook 13" Late 2009.
...Or continue using this MacBook with Linux, of course. I'd try creating a bootable hd on some other system. There should be an option to include the recovery partition. and swap back in.
Verify that the dvd and flash drive is bootable on some other system.
R Thanks, someone on stackoverflow suggested the same, and it's working so far. 最后更新：2017-10-10 01:32:34 上一篇： |