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My esteemed listmates, I'm trying to help do a telemedicine with a doctor on either of the following 2 laptops. On the Dell Latitude E6540 running W10, we can visit a Web site which tests your video and we can see ourselves on the laptop screen. But, when we conduct that Windows - Audio test it can't find the built-in microphone on this laptop. I've read a bunch of Googled results but they didn't correct this audio malfunction. On the other laptop - Dell latitude laptop running Windows 10 the audio mic test works and the audio registers and you can see the volume bars as you speak. But, the video test does not display anything on the laptop screen and the error message is that it can't find the built in camera. Again, I followed several Googled results but the video never worked. I tried these 2 suggestions.... Method 1: Make sure the camera app is turned on by: Press Windows key + I key (Win+ I) at the same time to open settings. Click Privacy. Click Camera in left pane. If it is off, turn it on. Says Camera access is on. Method 2 - Method 3: Check for outdated webcam driver: Select the Start button, type Device Manager, and then select Device Manager from the search results. Find your webcam under Imaging devices or Sound, video and game controllers. Press and hold (or right-click) the name of your webcam, and then select Properties. Select the Driver tab, select the Driver Details button, and look for a file name that includes stream.sys. If it’s there, your webcam was designed before Windows 7 and you'll have to replace it with a newer webcam. If you don't find a file name that includes stream.sys, try rolling back your webcam driver. I get the message that all drivers are up to date. I Powered laptop off and on- no difference. It has MS Defender AV installed. If either audio or video has not worked on your laptop in W10, would you please be so kind as to share what corrected either? Thank you so much. Charles. Charlotte County Public Library