[SOLVED] My monitor doesn't turn off any more when I shut down computer ?

[IntoTheMadcow]

Hello guys if someone can help me with my dads computer monitor I would really appreciate it. My HP2408 monitor wont turn off on its own when I shut down the computer like before. Now I must take the plug out of the wall for it to turn off and even when I press the power button on the monitor it still wont turn it off. It also displays weird colors when I turn off the computer, red white green black... Only way I can turn off the monitor is if I unplug the power cord. If someone could help me I would really appreciate it. Thank you

 

[Ralston18]

Does the following link match the monitor?

https://support.hp.com/us-en/document/c01097300

How are the computer and monitor connected?

Try another known working video cable.

Two input ports - correct?

VGA 15-pin D-type connector
DVI-D single-link connector

Try the other video port.

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Try another known working monitor on your dad's computer.

Try your dad's monitor on another known working computer.

Determine if the problem follows the monitor or stays with the current host computer.

 

[IntoTheMadcow]

hello yes that is the sa me monitor in the link, the monitor is connected by vga 15 pin there is only a vga 15