Can't copy, paste or drag anything in any program, desktop or document
Previous Troubleshooting: I am aware that I can click on any individual item and go to file/get info and then see if the ownerships and permissions allows me to read and write. In all of my cases, including the start up disc, it says I can "Read & Write" but this area is greyed out, uneditable.
I read all the related suggestions in the Help menu, but they seem to be all about standard procedure and no more than the above for troubleshooting.
Recent History: Recently I realized that my memory was almost full and much was tied up in the iTunes Music folder. I cleared out some of the iTunes and now have 3.59 GB available, enough to not get the message that the disc is almost full. (I'll clear out more, but intend on soon getting an external harddrive in part to save the bulk of the tunes). I also deleted a bunch of other stuff that I never use, but I didn't touch anything that appeared to be the nuts and bolts of the system, just documents and a few programs I don't use. (I did delete something called, "Visual balloons" that I had to unlock first, but I believe I had downloaded that along with some other application, VNC,long ago. I also removed the VNC. Was I right? Or is Visual Balloons important?).
Then, one day shortly thereafter when I started the computer it appeared to open in "Safe Mode" ... all the desktop icons super huge. So I restarted. The restart got the desktop icons back to normal size but thereafter I can't cut, paste, copy or drag anything anywhere.
Please advise. Thank you so much.
Power Mac G4 Mac OS X (10.3.4)