keyboard & mouse cutting out after a time

I'm running a G4 dual processor (MDD). Recently, the mouse and keyboard cut out after a few minutes and I have to restart. I've tried a different mouse, keyboard and USB port. I've zapped the PRAM. Nothing works. Also, since this started happening the screen at startup stays on the gray Mac screen much longer. I'd appreciate any advice...

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I should also point out that after connecting the mouse to the USB port on the back of my monitor, the mouse began to flash rhythmically, and continued to do so.

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Update: Although this has been up for a week and I have yet to hear from anyone re a possible solution, I discovered yesterday what the problem was - the keyboard was plugged into a bad USB port on the back of the monitor (and the mouse was plugged into the keyboard, so neither worked). Switching to the USB hub seems to have solved the problem (it was so obvious I missed it). I'm posting this in case someone finds themself in a similar situation. Cheers!

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