Monitor keeps turning off and on automatically [Closed]

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Hello,

My HP 2311gt monitor keeps turning off and on periodically around every 47 seconds. As i turn on the monitor for the first time everyday, it'll function perfectly without turning off and on maximum for 15 minutes and the problem will start to occur again.
I tried buying a new pair of power supply as i thought the problem was initially caused by overheating of the power supply, but after i bought a new one and tested it, the problem hasn't been solved. I really need help Thank you