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So keeping this in mind, AMD has released a new Catalyst Control Center app for PC users, offering new features and performance tweaks for its APU/GPU control application. Reason: The default driver for graphics card on Windows 10 is not a compatible driver for your hardware and does not install the right catalyst Control Center Software suite which enables all the functionality and also the HDMI port on your notebook and that’s why it does not detect the secondary display or you can not extend the display to even a projector. Solution:- First of all go to device manager and look for the Display Adapters list to see if there is anyone which has an exclamation mark or any problematic sign attached to it.If there is any, right click on them and select uninstall.Restart the computer and Install the updated driver downloaded from its manufacturer’s website.Sounds very easy!!! 🙂 but it’s not you have to first understand what has changed and why this happened to your notebook/Laptop. HDMI port on HP Pavilion Laptop is not working after windows 10 upgrade

Issue: My friend is using Windows 10 on HP Pavilion Notebook with AMD’s ATI Mobility Radeon HD 5470 graphics card to fulfill the need of APU/GPU.He was able to connect to his Haier LED TV with this notebook using HDMI cable without any problem untill he updated his Windows 7 Home premium to Windows 10 Home.His notebook’s HDMI port stopped working as if it does not detect any hardware connected to it.He could not extend the display to even a projector and the Windows+ P, combination keys showed problem with display driver and no options were available to extend the display.After spending two hours in troubleshooting I finally found the solution and it worked very well without me rolling Windows 10 back to windows 7.

HDMI Port not working after windows 10 upgrade