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I have one drive using Mojave with dual display working fine.
I have another drive with Snow Leopard that up till day or so ago was also working fine with dual display
Now Snow leopard isn't detecting the second display.
Any ideas.
Thanks
Mac Pro
On the Snow Leopard drive, try setting up another admin user account in System Preferences/Users & Groups to see if the same problem continues. Please post back on whether or not this worked. Also try the Safe Mode. Please post back on whether or not this worked.
Isolating an issue by using another user account
I have 3 drives in my Mac Pro, one using Mojave, another with El Cap and another with Snow Leopard, the last 2 for use with legacy programs.
Both Mojave and El Cap recognise and display 2 screens, but Snow Leopard doesn't. A month ago or even less I was able to view 2 screens in Snow Leopard but now I can't. The only thing that may have happened is some form of automatic update that may have occurred when I left the computer on overnight.
As long as you don't make a 'clean install' (which erases everything) the installation will simply replace the old System and all your documents and settings will be unaffected: however it's always a good idea to make a thorough backup before proceeding.
Thanks about that, I thought it might be, but just needed it confirmed. Since then I have swapped the drive with one that has an old copy of Snow Leopard and the computer still behaves the same.. This is a pity as I keep the old systems available in order to help someone who hasn't upgraded their computer. If you want to teach something it is easier if you each have a screen to work on.
Besides PRAM there is another test to try, I think it is something like disconnecting the Power cable and holding down the Power On button - can you remind me please.
Thanks
Hello
Neither suggestion made any difference I am afraid. I am thinking of re-loading Snow Leopard, but does this mean I wipe all my documents etc.
Thanks for the reminder. Unfortunately it didn't solve my original problem of Snow Leopard not detecting my second screen while Mojave will, probably beyond my limited knowledge.
dual display in Snow leopard.
