Screan keeps going black while it is on

have a hp 2009m monitor it wont stay lit up turn it on stays on 2 seconds then goes black turn it off and back on again and it comes back on again for 2 more seconds then goes black again  does any one  knows what the problem might be thanks               also im using windows 7 have another monitor and it works fine

Hello fixitguy,
Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
I understand your monitor keeps going off and on. There is very little troubleshooting available to a monitor. I would suggest you un-plug the power cord from the wall and the computer. Hold down the power button for 30 seconds and then plug it back in. If you are still having issues you can try restoring it to factory in the menu options on the monitor.
Otherwise, if the monitor is under warranty contact HP Technical Support for repair options.
You can also try to replace the power cord using the following part numbers. The parts can be purchased from the HP Parts Store.
8121-0729 - Argentina
8121-0735 - Chile
8121-0739 - Singapore, Hong Kong and the UK
8121-0740 - USA, Canada, Mexico, and Taiwan
If it is not under warranty and the power cord replacement does not work, it looks like you may need a new monitor.
I would like to thank you for posting on the HP Forums. Have a great day!
Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
Dunidar
I work on behalf of HP
Find out a bit more about me by checking out my profile!
"Customers don’t expect you to be perfect. They do expect you to fix things when they go wrong." ~ Donald Porter

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