Hi! I'm Eric, a computer expert who's been paired with you through JustAnswer.com. I'm reviewing your question now, and will return w/ an answer soon!
Just to confirm, have you already reinstalled Windows (or your operating system of choice) on the new hard drive?
Hi my name is ***** ***** I can assist. Have you plugged in a USB jump drive or external drive recently? If you have it might be trying to boot to it. If that is the case, try unplugging the USB and reboot your PC.