Ethernet and all USB ports stopped working

I have an Inspiron M531R-5535 and about 3 days ago I noticed that none of the USB ports were working when I tried to back up my phone.  The next day, the Ethernet port failed.  It is not the wire, as it works on a different computer.  My WIFI is working fine, but it is really slow, so I would love to be able to get the port working again.  I am extremely unknowledgeable about computers, so any advice on this would be greatly appreciated.  Thanks!

Rachel