Computer monitor not working

My computer monitor wont seem to work 
I go and  turn it on everything its fine and as soon as the welcome screen appear or in a few sec after, the screen starts glitching out and starts  turning on and of every 2sec other time it just stays off. i put the hdmi cable to the t.v to make sure the computer is working and its fine. and its wired becuse i went out for 2days the last time i was on i had no proplems when i came back  i turned it on and the screen went all purple then just turend of.  the monitor is a hp 2159m

Hello paulg100,
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 that your monitor turns off and on intermittently, the display appears discolored, and I would be happy to guide you towards a resolution!
To correct the visual display of your monitor, I recommend following this document on Display Quality Issues. This should help restore how your monitor dislays images, or determine if there is a hardware issue with the monitor.
If the issue persists, please call our technical support at 1-800-474-6836. If you live outside the US/Canada Region please click the link below to get the support number for your region.
http://www.hp.com/cgi-bin/hpsupport/index.pl
I hope this helps!
Have a great weekend!
MechPilot
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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