G4 Dual 800 Freezes At Desktop Screen With Cursor In Top Left Corner...

At OSX 10.4 startup my screen freezes as mentioned above. The clock is still accurately working and the usual startup sound occurs but the grey screen with logo takes longer than usual to reach the blue screen with icons and screentop info.
Problem occurred whilst selecting Safari icon to go on line. Until then the cursor had freely moved. The light on a wireless mouse shows power from the batteries and I know they're OK but the light on the signal source plugged into the screen rear USB point does not now light up (green - it's a Microsoft one).
I've got three different mouses and each indicates a lack of power to the system at that point. However, until the static cursor is reached on the desktop everything else seems to be working.
I've been through the usual keyboard steps in an effort to solve the problem and I've followed the previous comments earlier on in the year but my circumstances don't appear to be exactly the same....
Any A to B advice would be appreciated - thanks.

Thanks for that Tom.
Should have said.....When I first succeeded in gaining Safe Mode (after a number of attempts) I found that moving the cursor to the Dock, to the first icon it came across, the Finder one, it immediately froze the screen again, the same as when I selected Safari in the Dock first of all.
I'm still in the process of trying to get the Safe Mode to come up again but haven't yet succeeded with the required precision in selecting after the startup sound (well, I think that's what I'm about!). I'll call back again on progress shortly. If I manage it I'll try selecting the Tray operation.

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