I recently bought a prebuilt versa h18 tg online. I plugged all the cords in and proceeded to turn on the computer. However, I did not get more than a black screen and one "no signal" message. It says windows 10 should have been preinstalled at the store. I also looked up many videos and tried pressing the f2, f10, and delete buttons but nothing brought me to the bios screen. Any suggestions on what I should do?