No monitor signal received [Closed]

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I have a Dell Inspiron like 620s.
I start my computer and it works properly for 15-20 minutes.
All of the sudden the monitor turns black saying (entering power saying mode) but the computer Is working, after pressing the monitor button, the monitor shows the message, (There is no network coming from your computer).
What Can I do regarding this?
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Thank you
So the monitor shows that message, or the browser on the monitor shows that message. Monitors don't know about a network, FYI!

It loks like your network shuts down after going into power saving mode. Why don't you set the PC to not go into power saving mode. Do you know where those settings are?

This isn't a monitor issue, this is a PC configuration issue, and it is working as expected based on how your PC is set up for sleeping and power saving. What Operating system is it?