Hi David,
No doubt Ronni or Daniel will have more detail on this but, AFAIK:
1. In general, Macs won't boot from an operating system older than the one
they came with - so a new one will not be able to boot into SL.
2. You will be able to use moigration assistant to migrate your stuff over
from a SL computer OR disk, so:
* If you get your old iMac running again you can migrate from that.
* If you can¹t get the old one running but the external drive is a
bootable clone (ie up to date with all your info) you can just migrate from
that.
* If you can¹t get the old machine running and it has info you need (eg
it is more up to date than your external drive) you can remove its HD and
pop it into an external case, or use a suitable connection cable, and
migrate over from your (currently) internal HD.
HTH
Cheers
Neil
--
Neil R. Houghton
Albany, Western Australia
Tel: +61 8 9841 6063
Email: [email protected]
on 8/9/16 15:50, David Noel at [email protected] wrote:
> -- Thanks very much for that, Ronni. It looks as if the problem is just in the
> Power switch itself -- it has no spring feel. -- I find that my trusty iMac
> is now classed as 'obsolete' by Apple, so authorized Apple repairers won't
> take it on. I'm asking Daniel by CC about somebody who might fix it, the
> machine was working well up to the moment I powered it down, so it should be
> recoverable. -- I've ordered a new iMac, the old one was apparently eight
> years or so old, so I think I got my value from it. -- I have a 1.5 TB
> external drive attached to the old iMac, it is bootable with a 10.6.8 system.
> On the new iMac, would I be able to boot it from this external drive? Cheers,
> David On 8 September 2016 at 12:09, Ronni Brown <[email protected]> wrote: >
> Hello David, > > On 8 Sep 2016, at 11:34 AM, David Noel <[email protected]>
> wrote: > > HELP! I shut down my iMac and now the power switch on the back
> doesn't > bring it back up -- what can I do????? > > > David Noel > > (writing
> this on my wife's MacBook pro). > > > How to fix a Mac that won't start up:
> Step 1 - Check your Mac turns on > First, let's check that the problem is that
> your Mac won't start up, and not > that it won't turn on - those might sound
> like the same thing, but there's > actually a big difference. > Press the
> Power button on your Mac. If you don't hear a start-up chime, you > don't hear
> any fan or drive noise, and there are no images, video or visuals > of any
> sort on your display, then your Mac isn't turning on at all. You're > not even
> getting to the point where it refuses to start up. > > A Mac that doesn't turn
> on calls for a different approach to one that > doesn't start up. If your
> computer doesn't turn on then take a look at this > My Computer Won't Turn On
> support document from Apple. Apple suggests that > you: > > Check the
> connection to the power. > Try a different power cord or adaptor (if you have
> one). > Disconnect all accessories (such as printers and USB hubs). > If you
> recently installed new memory or a new hard drive, make sure they are >
> correctly installed and compatible (if possible re-install the old memory or >
> hard drive). > > > If none of these steps resolve the problem, then you should
> attempt to reset > the SMC (System Management Controller) > If inline link
> doesn¹t work here is complete link to SMC reset: >
> <https://support.apple.com/en-us/HT201295> > > Cheers, > Ronni > > 13-inch
> MacBook Air (April 2014) > 1.7GHz Dual-Core Intel Core i7, Turbo Boost to
> 3.3GHz > 8GB 1600MHz LPDDR3 SDRAM > 512GB PCIe-based Flash Storage > > El
> Capitan OS X 10.11.6 >
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