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!