If your PC powers on, with fans spinning and lights glowing, but your monitor shows “No Signal” or stays black, the cause is usually simple: a loose video cable, the wrong port, poorly seated RAM, or first-boot memory training that hasn’t finished yet. This is one of the most common problems in new PC builds, and most people solve it without replacing a single part. This guide walks you through 9 fixes in order, starting with the easiest. For each one, you’ll learn what the fix does, what success looks like, and when to move on to the next step.…