May be worth posting your problem on their forums?
Ah! Just spotted this advice.... run the Screen Configuration tool from the Preferences menu, right click on HDMI-1, Resolution, select the mode you want, and click the tick to apply it.
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https://uk.farnell.com/amec-thermasol/mpc222225t/heat-sink-ceramic-22-22-2-5-std/dp/1892474



Is that the