Dell XPS410 does not mean anything, all that matter is what is under the hood. I am sure 100% that it will play dvd's, almost all computers made in the past 5 years will play a DVD unless the DVD drive is bad.

For the tv, just get a 26" (or whatever size) TV that has a VGA port, most do and hook up the PC to the VGA port or if you PC has a HDMI port do it that way, since most tv's have more then one HDMI port then you can add another hdmi device with out getting a hdmi extender box. And a TV will be cheaper then a monitor and with a tv you can watch stuff over the air, better PQ depending on brand and speakers too.