Toshiba Laptop Stopped Recognizing Nano

I have two laptops both running windows 7. One laptop still reads and syncs nano, the other stopped. This is an ipod Nano multi-touch. Recently, the Toshiba laptop had the motherboard replaced. This is when it stopped responding to the nano when I plug it in via usb. Absolutely nothing happens. No error, no funny logo on the nano, it's like nothing was plugged in to the laptop. The nano and laptop just look at each other like "what?" My first thought is it needs drivers cuz that's how pc's work. Eveyrthing is about drivers. Other devices are recognized when I plug them into usb such as android phone, mouse etc. The nano is also recognized by other computers. Any suggestions?