So a couple month ago my computer screen droped WHILE ON.So I just now finely got a brand new computer screen,just to find out that it says no signal found.I have tried different moniters but it says the same thing.So my theory is that it's the computer itself and that when the computer screen droped it shocked or damaged my video card.I can get a new video card if that's the problem, but I want to make shure I haven't missed anything.

No, you pretty much got it. If you have tried a few monitors and all getting no signal, that would indicate that the video card is toast.

Or that its loose or something?

Well, all you can do is try to reseat the card to see if that would make a difference

Of course ground yourself to the chasis of the case and remove the card with even force and then what you can try is to put it into another avail slot if you have one avail and when reseating the card, push it in slot using even force, make sure it is all the way in and then attach a monitor up to it and see what you get and go from there.

If no signal after reseating, it would indicate the monitor or the card, but as you have tried a few different monitors, that would indicate the card is faulty

Will do,my screen I have now is brand new so it's the card

Try reseating the card or moving it to another compatabile spot on the motherboard and trying that if it don't work then the card is likely dead