Mountain Lion monitors bitmapped

Hi,
I have a Mac Pro 2008 model, I was on Snow Leopard until recently, skipped Lion and just installed Mountain Lion, now my two Samsung 920N monitors are almost impossible to look at, they are nearly as bad as 1980's bitmapped but blurry and ghosted as well.
Under Snow Leopard they looked great. I have tried everything I can to fix the display but no luck. I have tried all adjustments on the monitors themselves and in Preferences.
I have looked at the Samsung site for drivers but nothing there.
Any ideas would be VERY welcome as my poor old eyes are hurting!
Thanks
Greg

If you find yourself needing to download Lion or ML - and you might want Lion ?
You can save the installer package before it goes through and installs, because just like in the TV series, it 'self distructs' when it reboots after it starts the install.
That way you have it on hand; can do a clean install easily on your own.
Lion and ML can be clean installed to another drive, just choose where.
Making bootable backup clones of the system is the way to go, use that for system at least, maybe for important data drives and volumes - and use TimeMachine for your data. Not as much use for the OS or system if you ask.
Some 'reading' and reference for later:
Using Cloning as a Backup Strategy
http://www.macupdate.com/app/mac/7032/carbon-copy-cloner
http://www.bombich.com/software/updates/ccc-3.5.html
Lion Recovery Mode (ML also)
http://www.apple.com/support/lion/installrecovery/
TimeMachine 101
https://support.apple.com/kb/HT1427
How to relocate system and user data to another drive (Easy but "advanced" tip useful for performance and maintenance of your system)
http://support.apple.com/kb/HT4337
http://chris.pirillo.com/how-to-move-the-home-folder-in-os-x-and-why/
To successfully relocate your operating system, user accounts and data from one storage device to another,
How to make a bootable Lion or ML install drive
http://osxdaily.com/2012/07/25/create-os-x-mountain-lion-boot-dvd-usb-drive-lion diskmaker/
https://www.macworld.com/article/1167857/how_to_make_a_bootable_mountain_lion_in stall_drive.html
Lion and Mountain Lion Installer Maker
http://blog.gete.net/lion-diskmaker-us/
https://www.macworld.com/article/1167857/how_to_make_a_bootable_mountain_lion_in stall_drive.html
OS X Lion Install to Different Drive
How to create an OS X Lion installation disc MacFixIt
Create an OS X Lion Install disc (older version for Lion MacFixit July 2011)
http://reviews.cnet.com/8301-13727_7-20080989-263/how-to-create-an-os-x-lion-ins tallation-disc
Should you do a "clean install" of Mountain Lion?
How to install Mountain Lion over Leopard
Hands on with Mountain Lion's OS X Recovery and Internet Recovery
« Return to How to Install Mountain Lion

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