Hello, I just inherited an old imac and was trying to set it up. Plugged in the keyboard and mouse, and a USB hub, turned it on and got an error message that the USB device was drawing too much power and the port would be disabled. Keyboard and mouse stopped working. I then turned it off (which seems to have been my mistake), and when I turned it on again (without the USB hub this time) the keyboard and mouse continued to not work. I unplugged them and plugged them back in, no luck. I have since tried restarting the computer, with or without keyboard and mouse, etc., they will not work. I can't get past the login screen. The mouse is optical and lights up when plugged in but will not move the cursor. Both the mouse and keyboard work on other computers. I have seen advice on how to boot in safe mode, or reset the memory, etc., but all of these require a keyboard at the least -- is there any way I can fix this problem without a mouse or keyboard?