P2014H, Flickering when turning on


I bought a second hand P2014H. But after one week, when I turn the P2014H on, it was flickering after being off overnight. I tried the Hard Reset and reading the P2014H Manual to search the occurring flickering of monitor. I also tried restoring the P2014H to factory reset but not even one is working. Here is the link on what is happening when turning on my P2014H. Monitor flickering when opening. Now It still open but have to turn on and off for about 20-30 mins. But once my P2014H was on, it is not flickering unless turned off and leave overnight.

My computer's a custom built, Intel Core i3 3240 @ 3.40GHz 8GB Ra
GPU: 2GB ATI AMD Radeon HD 6570

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