Connecting the PC to the TV
If both the TV and the PC hardware support has at least a VGA/HDMI port, and a 3.5mm audio out jack on the PC (may be simply labeled as "headphones"), it is possible to watch videos on the TV without the need for an additional monitor for the PC. This usually means that most CRT TVs (old ones especially) don't have it without using adapters that are bulky, messy, and output video quality is decreased from the original video. The hardware configuration is more important than the operating system, which determines how good the video plays back. It's best if no conversion is needed just to play the video, so a Pentium 4 PC or older is obviously out if you want a smooth playback of a video that is at least 720p. I have a Pentium 2 PC with 384MB of RAM on Windows XP (upgraded from 64MB on Windows 95), and it's already struggling with any low-res video. In general, any PC in the 2nd-hand store that are from the 2006-era or more recent is capable of playing it smoothly