Imac 20" keyboard and mouse not working

Friend has a 20″ imac 2007 usb ports don’t seem to be working can’t use keyboard or mouse, anyone any idea how to get into the system to use a hardware test disc or install disc
Power seems to be going to the mouse as the red light emits from the bottom.

has anyone resolved this problem? I haven't been able to get my usb ports to work on my 2007 24" imac. it suddenly stopped responding to keyboard and mouse. during bootup, i can use the keyboard to select boot volume and/or target mode. keyboard and other usb peripherals work fine on other computers. so this indicates that the keyboard is ok, the usb port themselves are ok, but something happens during bootup that causes the computer to stop listening to the usb ports.
i've tried the smc and pram reset procedures with no luck.

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