sounds as if your usb is acting as the first boot up choice when connected.keep pressing del on boot up and go in to bios and make sure that cd is first boot up choice and your hard drive second choice do this without the usb connected
Android Oreo News: Release Date & New Features
11 must-have iMessage stickers packs by Jean Jullian, Christoph Niemann, Jon Burgerman & more
iMac 21.5-inch (2017) review
Que faire en cas de vol ou perte de votre smartphone ?