Q: It is an HP pc .I've tried everything!
A: Some troubleshooting techniques are needed. First is the monitor really functional. Have you plugged in into another computer and does it work. Ok, if it does, you need to check whether or not your USB port is working, is this a usb monitor? Will the computer work with another monitor? Maybe you need to replace your video adapter. If you put another video adapter in does it work?