Late yesterday pm, the app I was using SiperDuper, seemed to have stopped; the progress bar didn't! Then, another app quit responding...and another...and finally everything froze except the mouse. Gave it about 15 minutes before pressing the power button.
Restarted, never got past the grey screen.
Restarted with Applejack in auto. Ran repairs. Restart got the the blue screen and a constantly spinning gear.
Restarted with Applejack in AUTO. Repairs take longer because of added tasks. Restart no better than before.
Restarted with Diskwarrier. Says it repaired many things. Still unable to complete start up. But I waited longer and saw that the blue screen and spinning gear were acting strangely, The gear would make 5 revolutions and disappear for a few seconds and do the same thing over and over and over and...
Ran DW again. It froze.
One more time with DW. More fixes, still claiming that all was repaired. Except still no complete start up.
Now trying TechTool Pro. Shows another 16+ minutes to complete Surface Scan. It had previously found 1,300+ empty plist files! And many of them were "Global..." plists. I seriously suspect that's why the start ups are never finished. I surmise that many of these "Global" plist files are created and populated when the OS is installed. They are now either corrupt, empty, moved or all three. Basically the OS os "hosed" to use a technical term!
If TTP doesn't change things for the better, I may run DW again, but it is beginning to look like I need to find my Install disks...