Computer makes flickering sound

So I bought myself a new monitor. When ever I turn it on my computer makes this flickering sound. The monitor runs a resolution of 2560x1440, which is alot more than my old monitor.

I was thinking it might be my graphicscard struggling, or maybe my powersupply struggling. But Im not sure, and I don't have any hardware lyeing around to test it.

So I was hoping someone in here could hint me in the right direction, so I don't have to spend money on a new power supply and graphics card.

I got a 1000W power supply and my graphics card is a ATI radeon HD 5800 series.
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  1. oh yeah, and I've already tried updating the bios to no success.
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