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MAC applications cannot be opened
My Powerbook G4 crashed 2 months ago. We have used it since but now my printer application will not open. It reads printer proxy error. I installed quickbooks and entered information recently but a week later when I tried to open the application again, it did not open. We have checked Disk Utility and it did not help. What needs to be done? We have tried to open these applications in Applications folder, on the desktop, and on the tool bar.
Powerbook G4
OS X version 10.3.9
Processor 1.67 GHz
Memory 512 MB DDR SDRAM