Several issues, even though I gave it a 5. The first issue is that the 4 USB 3.0 ports were dead. Online Dell drivers didn't work. I had several driver disks from USB 3.0 cards, and one of those worked.This computer has no HDMI port but uses (3) DisplayPort connections and a DVI port on a plug-in card. They sent a display port to an HDMI adaptor. I didn't bother to check the USB WIFI unit.Now the rest is very positive. It came with a new Windows 10. All the user has to do is register and add the programs they use. The computer is fast and works great. Most importantly, it runs very cool temperature-wise. The power supply gets just a little warm. That greatly extends the life of the computer.