A:AnswerThis HP desktop will not have a webcam built-in, but it will work with a USB webcam. The USB webcams will attach to the top of your current monitor.
A:AnswerThe power supply in this model can not be upgraded. I believe it is a custom size, and you will only be able to install the same type of power supply that is installed and not a bigger one. There are some low power GPU models you can look at that will work with a 300 Watt Power Supply. I would google search for "low power GPU" and see what you can find.