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Using Mac OS 10.6.8 on my MacPro, but have 10.7 (something) newly installed on another disc.
The 10.6.8 is my "default" disc for the time being.
But why doesn't the 10.7 show up among the system preferences startup disc options while the disc itself does when I launch Disk Utility?
(Oh, sorry for not using those cat names or whatever for the systems. Never learned to remember the order of Lion, Snow Leopard, etc, whilst 10.6, 10.7 a.s.o. is pretty obvious...)
I would assume without knowing more that the other drive is possibly not partitioned and formatted properly and/or Lion is not correctly installed to be a bootable system.
Both disks are absolutely fine and so are the systems on bth of them.
I just reset the NVDram (Opt Cmd P R) and the computer booted right away and nicely from the 10.7 (which actually is 10.10. Sorry).
Then, hoping everything was OK, I went back to the 10.6 disk. But the 10.10 still won't show.
That is normal. The 10.6 Startup Disk software isn't able to recognize 10.10 due to changes. My 10.6 partition does the same thing.
Got a response from Eric Root (notified by mail). But I can't see that reply in the thread. Sigh....
Here's what Eric wrote:
That is normal. The 10.6 Startup Disk software isn't able to recognize 10.10 due to changes. My 10.6 partition does the same thing.
Per se, it doesn't solve the problem, but at least I got an explanation. Why Apple won't make their various systems recognize each other is another story...
If anybody knows a remedy, please holler.....
Thanks, Eric.
You are welcome.
Hi Dan,
Try an option boot; hold down the option key until a "list" of viable startup disks is shown. Then select the 10.10 disk. If this works, it's at least a work-around for you.
tjk,
Yeah, tried that right away and the 10.10 disc shows fine. Could even select it. But not "activate" it. I.e. used arrow keys to select it and the arrow beneath the disc symbol were marked. Could even mark/select the actual disc symbol. But after that, I couldn't make anything happen regardless what I did (clicked with mouse, hit "enter" or whatever...).
Dan
In 10.6, open Disk Utility, select the 10.10 partition and make sure it is formatted Mac OS Extended (Journaled) with GUID format. What type of computer do you have? Mac Pro or Macbook Pro?
Hi Eric,
The 10.10 disc is formatted Extended (Journaled) and has GUID Partition table.
Visible in the disk utility, but not as startup disk in system preferences.
I've got an MacPro (i.e. not book). In the computer world, it's old as ****. I think it's an early 2008.
Dan
Can't see boot disc
