Video card doesn't fit into AGP

I just got a new Compaq computer with an on-board video. It also has an AGP slot. On my previous machine I had a nice AGP video card, so I wanted to place that into the new machine. However, the video card physically does not fit into the new AGP slot. The part that sticks out by a couple millimeters is that short plastic piece that has no wires/contacts on it. What do I do? Why wouldn't the card just fit?
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I would say that it is an older version of AGP. Does it work in the new machine though?

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afridmanAuthor Commented:
I must not have explained the situation clearly. The card is fairly new: it's a 64 Mb GeForce4. This card works just fine in the old machine (P3, 733 Mhz). The new machine is AMD 2000+. The video card does not fit into the AGP slot on the new machine.
and it doesn't work? i have had cards like that , that will fit..but hang over
there is a new AGP rev out... voltage differences, third "section" connector.. called AGP Pro or something like that.

I would go onto Compaq's site and see what they call this slot
afridmanAuthor Commented:
I figured it out: the card slot just needed to unlocked. You pull on it before inserting the card. I'll just give the points to the first person who answered. Thanks for your time.
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