Weird black lines appear on monitor for a few seconds sometimes. Recently, when I'm browsing the internet with white backgrou

Recently, when I'm browsing the internet with white background, I started to notice that my monitor sometimes make these 1~2 small black/discolored horizontal lines in the middle of my screen for a few seconds and it disappears.

The line is not through my whole screen at all. It is only 1~2 inches long and appears only 2~3 seconds too. And happens rarely too. However, I do not know if this is my monitor problem or graphics problem.

I recently overclocked my graphics card.

I had my monitor for more than 5~6 years. For the past 6~7 months it started to make these 'clicky' or 'popping/cracking noise' even when I was not using the monitor, so I thought my monitor was dying...

So could the 'black line' be cause by monitor or graphics card? Which one do you think it is?
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More about weird black lines monitor seconds recently browsing internet white backgrou
  1. check your GPU temps first and clock it back to standard clock. Both could be the cause. If you can, also try a different monitor.
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