I'm trying to install Photoshop CS4 for the very first time onto a Mac Powerbook G4, MacOS 10.4.11. The installation succeeded, but when I launch Photoshop CS4, I get the "Could not open a scratch file because the disk is not available" error followed by the "Could not initialize Photoshop because the disk is nor available" error. There is only one disk in the Powerbook, at it has 27GB free space.
The FAQ advice is to reset preferences. I did that repeatedly by holding down cmd-option-shift while starting up Photoshop and answering "yes" when it asks to delete the preference file. Didn't help. Same errors occur.
I also deleted the ~/Library/Preferences/Adobe Photoshop CS4 Settings and ~/Library/Application Support/Adobe folder hierarchies. Didn't help. I did the above together. Didn't help. Same errors occur.
I uninstalled Photoshop and reinstalled it. Didn't help. Still get the same errors.
I even deleted the root /Library/Application Support/Adobe/ folder tree, which then forced another complete reinstallation of Photoshop CS4 because that killed the license manager. Didn't help. Still get the same errors.
Where else could preferences be lurking? I've never been able to successfully launch Photoshop CS4 on this Mac, so I guess it must be trying to import something weird from another Adobe application.
There is only one disk in the Powerbook, at it has 27GB free space.
First thing that comes to mind is the lack of free hard drive space. Photoshop writes scratch from the beginning when you open it up. If there is not enough room or no scratch disk then Photoshop will not start up. The OS is using the same free space for writing SWAP files.
Also CS4 is not supported on a G4.
The only solution I can think is to delete some unneeded files and see if opening up some free space will solve the problem.
If 27GB of free disk space is not enough to launch Photoshop, I'm curious what is. I have no other applications running, so swap space usage is negligible. Adobe's requirements state that 2GB disk space is sufficient for Photoshop CS4.
27 GB free disk space is more than enough.
But as Buko wrote you: "Also CS4 is not supported on a G4."
But I know that some people has succeeded with the G4, not optimal but running though.
Have you tried booting from a system disk and run the Repair Permissions?
I thought that maybe it could be a diskpermission problem - but maybe it's a long shot.
I would not not use scratch disk smaller than 40GB most here have scratch disks of 100GB minimum. and these scratch disks are second drives not the system drive.
Get some DVDs burn your important files to them and get those files off your hard drive. You don't give us any other info about your setup. so its hard to say.