Need help connecting HTPC to TV!

OK, I'm building an HTPC to accompany a big old CRT TV, and I'm having a bit of a struggle: I can't seem to find a way to hook up the video!

The TV has these input ports:
Composite RCA (yellow)
S-Video
Coaxial

The HTPC has these output ports:
HDMI
VGA/D-SUB
DVI-D (dual link)

I've tried looking up different matches of these connectors without success. Can anyone think of any options?

What type of video card does your HTPC use? Most video cards come with TV out that should provide S-Video.

Or, you'll need to get a scan converter which isn't that great.

List your components out.

Welcome to the site.

It's an onboard ATI Radeon HD 4200.

You're lucky, my TV doesn't even have those ports, all it has is a cable TV hookup.

Does it have any TV out cables?

If not, a scan converter or an additional video card is your best bet.

I've never seen an onboard video controller that offered any kind of TV out. I'm not even going to suggest a scan converter as an option. A cheap, bottom level graphics card would probably be cheaper than a decent scan converter, and would net you a (largely insignificant) boost in performance as well.

The problem is that most low-range GPUs no longer come with any kind of TV out, because it is cheaper to just to include HDMI, VGA and/or DVI (as well as the fact that nVidia drivers, and possibly ATi ones as well, no longer support S-Video in Windows 7); however, make sure you end up getting a modern one. Sub-$40 GPUs do contain cutdown versions of perfectly modern cards, but there is also a bunch of really terrible and outdated stuff among them like GeForce FX5200s and Radeon 7000s (the Wal-Mart website even has a rebadge of that lovely bottom tier junk dating to 2001, the GeForce MX440). There are GeForce 8400s available with S-Video out, so see you can find one of them that you are okay with.