The question is very general. TV or entertainment cabinets are easy to get images to show you. PC cabinetry usually comprises a desk of sorts, which would be inordinate to a TV/entertainment system.
My suggestion is to start with whatever you need to incorporate the computer related items, and then modify the sketch to house a TV or other audio/visual components. Or, start with a TV cabinet, and add the related PC requirements. Finding images of both in one piece might be a lucky find. It was mentioned that sizes weren't given. A simple desk assembly that would allow viewing of a small TV, like 20" or less on an "L" shape is a possibility. Then again, a desk wasn't mentioned. So, you can see that details are important.

