Alandoni post the Model Number of the Gateway Desktop PC
Post back in a Comment.http://support.gateway.com/us/en/support/default.aspx
I'm going to assume you are trying to install a Firewire adapter card.
They make Firewire adapter cards that fit a long white PCI slot, on the motherboard,http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=3264905&CatId=511http://en.wikipedia.org/wiki/PCI_local_bus
,and a Firewire adapter card that fits a PCI-Express x1 slot,http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=4624358&CatId=510http://en.wikipedia.org/wiki/PCI_Expresshttp://en.wikipedia.org/wiki/PCI_Express#Form_factors
[NOTE* Color of connector does NOT matter. Blue, Black, Pink with Yellow polka dots............doesn't matter ]
Do I assume you have the PCI-Express x1 version, and there is no PCI-Express x1 slot on the motherboard?
You are also having problems opening the cover, that keeps the brackets of add-on expansion cards in place.
How about posting the Model Number of the Gateway Desktop PC?
This is found on the back of the desktop computer, next to the Windows product key; or up on the side of the computer tower.
Post back in a Comment.
I will look to see how to open that cover, and what expansion slots you have on your motherboard. Then post back in a Comment.