GF 8400gs 512 mb - XFX NVIDIA GeForce 8500 Graphic Card

You could uninstall and re-install, if you havent done that for a few months its a good idea because there is now a better version out.

Make sure the TV is on the correct input selection.

click here and enjoy

Just click this link and you are there boss. Choose your OS, download, run, and enjoy

I don't know what your OS is so you can find it here

http://www.geforce.com/drivers

http://www.msi.com/product/vga/N8400GS-D512H.html#/?div=Driver&os=All select your operating system and you are good (e.g. windows xp x64)

Just buy a new one. only you know what you want it for, and how much you have to spend.

http://www.msi.com/product/vga/N8400GS-D512H.html#/?div=Driver&os=Win7%2032

What was your old card and is it pci-e (PCI - express). Also what motherboard do you have?

First, you need to be sure you have installed the correct drivers for the card that corresponds to your OS.

Second, you need to go into the control panel (assuming you are running Windows of course) and tell the computer you now have a new graphics card installed and to use it instead of the default one detected when the OS was installed.

Reattach the monitor to the GeForce card and reboot. All should be OK.