I have connected an hdmi to hdmi cable from my graphics card to the appropriate hdmi port on my hdtv, but when I change the tv 'source' to the appropriate location, my tv says no signal. I can't find anything else in my manuals to do differently. My computer is a home built (Biostar TH67+, Intel Core-i7 2600k, EvGA GTX 570, 8GB G.Skill Ripjaws DDR3 1333) (I know that I need to connect for sound, but I want to just the do video first.) Is there anything else I need to do? Is this just something else that I need Windows for?

You don't say what version/distro of Linux you're using, or what you've done so far, so it's hard to say.

First, if you haven't already, go to nVidia's website, and download the latest drivers for your card, and follow the instructions to install them. Usually it's a .run file, so download it, run "chmod 755" on that file, then run "sudo init 3", or enter a "3" at your GRUB menu. That'll take you to command-prompt mode, and stop X. After that, as root, run the .run file (I usually get lazy and just type in "./*.run"). If you've got your kernel sources installed, it'll compile you a custom driver, and install it. Reboot, and you're done, and that *MAY* be it. You may have to run nvidia-settings, and be able to choose display's, or have them auto-detected.

Sometimes you have to manually set the X server to find it. In your /etc/X11/xorg.conf file, look for the "Device" section, and try putting in something like:

TBOne, (like your handle, btw) I'm using Linux Mint 13 because I'm poor, cheap, and really dislike Gates and Jos. However, I am not very good with linux. I'm really a GUI guy and do not use the command line unless I have to (and then I need help). Thanks for your reply. I'll give it a shot.

You can issue "sudo vi /etc/X11/xorg.conf " and just scroll down. Easy to find, but don't shy away from the command line....once you get used to it, you'll find it's much faster for most things.

If you use Mint it becomes much easier for you. Start the system with a conventional monitor, start the "Additional Drivers" program and activate the proprietary driver.
After a reboot you can simply use Nvidia's settings tool to configure your monitors.

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Well, yeah...you COULD do that, if you like to do things the easy way.

Which is why people use Mint or Ubuntu in the first place, I would guess.