Troubleshoot Video Cards
When you look inside any open computer,see if you can locate the Video Card.Is your video card mounted in an adapter slot or is it integrated onto the motherboard.If the card is motherboard integrated,locate the jumpers that will allow the card to be disabled should you need to install another card.

The Monitor is the second component in the video ...

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also when your computer startz... and you hear a long beep or something like that... it means your video card is bad or not inserted properly...this can help when troubleshooting.