Question Monitor issues

Jun 18, 2019
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I don't know if I am wording any of this correctly, so please bare with me.
Here's the issue. My bosses computer boots up, I see the Window's Logo and everything, it looks as though everything will be fine, however, at the last second it seems, the monitor reads no signal.
I know the computer is up and running cause I can hear the start up sound as well as when I hit the CAPS button, I see the light go on and off on the keyboard.
Can anyone help me?