Usb port overload. I have 4 ports on my laptop - I had 3 items plugged into the USB ports - when I

Question

I have 4 ports on my laptop - I had 3 items plugged into the USB ports - when I added a 4th - POOF - nothing from any of them. I have tried to remove the drivers - reboot and "find new hardware" but that isn't working... what else can I do - or is there a "trick" in the previous I don't know about... THANKS