Kindly note that laser mouse doesn't have a visible light at the bottom. Only optical mouse has red light at the bottom. If you don't see the red light at the bottom, but still the mouse is working fine, then it's a laser mouse. If not, you can try the steps as posted by DELL-Shawn

Hi smdell2014,

Thanks for your post. Sorry to hear that mouse is giving you trouble. From what your describing the replacement mouse that you received is also not functioning? If this is correct do you have another system that you could test the mouse with, this should help pin the issue down either to a faulty USB port on your system or a failed mouse. Depending on the model system you have I would also recommend testing on both front /back USB ports (on a desktop) or left and right (on a notebook), commonly these ports would use differing internal hardware connections and could point to a specific internal component failure.

If the problem can’t be narrowed down to a specific USB port I would suggest checking the device manager does not have any errors listed and that the USB ports are enabled in the system BIOS.

What is the specific model of mouse you are using / have you an alternate to test? If the mouse is functioning but the laser doesn’t seem visible, some newer mice have minimal glow in comparison to older model laser mice.

Troubleshooting Dell USB Keyboards and Mice

http://www.dell.com/support/troubleshooting/us/en/19/KCS/KcsArticles/ArticleView?c=&l=&s=&docid=277550 

Thanks,