I purchased this new HP Laptop from Amazon.  After it was received, the first time I tried to use it for a Zoom meeting I could hear the participants but they could not hear me.  It is under warranty with HP.  I contacted HP Support and spent over 10 hours with technicians wherein they try to diagnose and fix.  They tried everything and eventually tried reformatting the Windows 10 operating system.  All to no avail.  Internal microphone would not work.  They have since arranged for the computer to be returned to HP for repair.  It took about 7 days to receive the box for return.  I sent the computer to HP for repair location the following day.  I have no idea how long it will take for it to arrive at HP's repair facility and thereafter have it fixed and returned.  I also have no idea whether it can be fixed and am not happy that I purchased a new computer and immediately am dealing with a necessary repair.