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Question:

What could be wrong with Tim’s display if he finds that his computer monitor shows no image on the screen after switching it on after coming into work early to assist on a project He checks and validates that he is getting power to both the computer and monitor, so that shouldn’t be an issue.

A The VGA connection was not seated completely.
Explaination

Generally, cabling issues, e.g., something is unplugged or not fully connected are the most common reasons for images not showing on the screen. VGA, DVI, DisplayPort, or HDMI are typical display cables either.