You go to work after a long weekend and try to turn on your computer. When you push the button on the desktop, the system does not start to boot. The monitor turns on and displays a message saying that there’s no signal. When you push the desktop button again, you notice that the lights on the computer are turning on, but you don’t hear any sounds coming from the desktop.

Explanation:

A loose connection between your monitor and your PC will trigger the monitor no signal issue. If you’re seeing the no signal message on your screen when your Windows system is running, the first thing you should check is whether your compatible video cable is firmly connected or not.

Answer is , The problem is Power cord seems unplugged.

Refer below for the explanation.

Explanation:

When you came to work after long weekend the proboem happens and monitor displays that there is no signal, it directs to the problem that the cord is unplugged.