Monitor is going to Sleep

Hello,
i have 2 HP PRO 3500MT
one of them won't start: error
Monitor is going to sleep,  when i start the comp.
the numlock light on the keyboard won't go on.
i use the videocard onboard VGA.
i have changed
memory
HDD
PSU
different Screens
stand allone Videocard VGA / DVI
differrent cable's VGA / DVI
but it the error stay''s
mainboard broken?

Enter the Control Panel. Click on Power options -->edit plan settings Change Power option settings and verify that there are no settings enabled that are causing this.
 As a test you can select and enter the choose when to turn off the display option, select never and then save the setting.
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    Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
    Click the “Kudos, Thumbs Up" on the right to say “Thanks” for helping!

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    I work on behalf of HP
    Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
    Click the “Kudos, Thumbs Up" on the right to say “Thanks” for helping!

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    Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
    Click the “Kudos, Thumbs Up" on the bottom right to say “Thanks” for helping!

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    Click the “Kudos Thumbs Up" on the right to say “Thanks” for helping!
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