dell dimensions 4400

Does it work when you're plugged into the motherboard?

Within your BIOS there should be an option to turn on the video card slots. In most cases they aren't enabled.
 
This is a very old computer. Your motherboard is most likely shot. You can try resetting the cmos by removing the battery. Unplug power from power supply, remove cmos battery, press and hold power button on case for 10 seconds then wait 10 minutes. Then reinsert battery, reconnect power and try booting up.
 
its ok messed it up now blew power supply popped and smoked on me new question would that have affected the ram? no harddrive was connected or disc drives thanks
 
Possibly. Nothing in that machine is worth salvaging. It's way too old to spend any money on it too. Just replace it.
 
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