On our Dell notebook the USB port began to act erratically. Some items work when plugged in but some - like a Memorex flash memory - are not recognized by Windows. According to Systems, the USB port is working correctly. With my Panasonic mp3 player, I can wiggle the unit in the slot and it begins to load but then it is not recognized.
These used to work perfectly. An SD card reader continues to work normally.
I would like to buy a plug in USB port that goes in the side in the bus slot, rather than spend a lot of money to get the port repaired.
I pretty much a novice with computers.