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My monitor goes black when I set the refresh rate to 240Hz

Baked_Been
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I use my laptop for gaming (ew a gaming laptop, I know I know, its not my favorite either, but it works, and I'm on a budget so what can you do) and previously had a second monitor that had only 60Hz refresh rate, i recently purchased a newer monitor capable of going 240Hz, however when I set the refresh rate to 240Hz my screen goes black and the returns to 144Hz which I have set it to while I troubleshoot. if it helps the exact monitor is the AOC C27G2Z (https://us.aoc.com/en-US/gaming/products/monitors/c27g2z) while 144Hz is outstanding compared to 60Hz and I cant understand how I used 60Hz before, I would like to be able to use the full potential of the monitor 

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Are you using the DisplayPort? If not do so, HDMI is limited even with a 2.1 cable

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17 minutes ago, jerem222 said:

Are you using the DisplayPort? If not do so, HDMI is limited even with a 2.1 cable

my laptop is around 6 years old and it has only 1 HDMI port, an ethernet port, a headphone jack and 3 usb ports, is the lack of using a display port preventing me from using my monitors full power? 

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Yes, with that old HDMI you're probably even stretching it using 144Hz.

M.S.C.E. (M.Sc. Computer Engineering), IT specialist in a hospital, 30+ years of gaming, 20+ years of computer enthusiasm, Geek, Trekkie, anime fan

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14 minutes ago, 191x7 said:

Yes, with that old HDMI you're probably even stretching it using 144Hz.

ahh that's rough, is there any other way at all or would I need a new laptop/computer to use 240Hz?

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1 hour ago, Baked_Been said:

ahh that's rough, is there any other way at all or would I need a new laptop/computer to use 240Hz?

make sure that the cable supports 240 hz but if it does not it is the lapotop and there is nothing that u can do 

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Hdmi 2.0 and 2.1 are essentially the same thing

(Cable and connector) it is only from a per vendor side the limiation appears as VESA left to each of them to ruin the buying experience, watch Linus video on the topic

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