![]() You can also use your TV for this purpose. If you aren't currently using an external monitor, you may want to hook one up to see if the problem is your laptop's screen or its internal components. If you're trying to run a 4K display at a high refresh rate, you'll need an Ultra High Speed HDMI cable, rather than an older High Speed model. Remember, not all cables are created equal. If you're using DisplayPort, make sure it's certified by VESA for HDMI, it may have a certification label on the packaging you can scan with the HDMI Cable Certification app for iPhone or Android. In addition, make sure your cable has the right specs for the job. HDMI-to-VGA adapters, for example, only work in that direction-if you're trying to hook a VGA computer to a DVI monitor, you'll need a different type of active converter. You could have a faulty dongle or are just using it in a way it wasn't intended to be used. ![]() The culprit could also be an adapter, if you're using one of those. If you have a graphics card, your monitor should be plugged into that, not the HDMI port on your motherboard. If your computer offers multiple connection options, you might also try a different cable type-say, an HDMI cable instead of a DisplayPort cable-to see if that solves the issue. It could also be the result of a malfunctioning USB port, so try a different port as well. If you have any extra cables lying around, try another one-maybe the cable you’ve been using is damaged. Outside of power, there could be an issue with the connection between computer and monitor. Similarly, the screen may have been disabled or confused after being disconnected from an external monitor, so try holding the function key and pressing any button that looks like a computer display along the top of the keyboard. Your keyboard should have brightness buttons at the top, so see if that fixes the issue. Many laptops let you dim the screen down to nothing, so raise the brightness to see if that's the culprit. You should be able to hold down on your computer's power button until the light turns off, then just turn it back on. If your computer is on, try rebooting to see if the problem persists.
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