The eMachines W3400 desktop computer has an MSI MS-7145 motherboard.
(MSI = Micro Star International, Inc)
This is the MSI MS-7145 motherboard,
http://www.e4allupgraders.info/dir1/motherboards/socket754/msi7145.shtmlThe MSI MS-7145 motherboard, has one PCI Express x16 expansion slot, which is used for a graphics card.
Viewing the bottom left of the photo, you will see three white PCI slots.
Right above them is a longer white slot.
This is a PCI Express x16, expansion slot.
Scrolling down to the subheading - Expansion Slots,
You will see - One PCI Express 16x slot, listed.
Should you require information in installing a PCI Express graphics card, or information on which PCI Express graphics card may fit your needs, state so in a Comment.
(Believe upper right of your page)
This question is in english, but the motherboard model your asking about is not an english model or is not available on the english speaking MSI websites. Title the question with the country origin your motherboard came from and then ask in that language.
MS-6787 is not available in america so I cannot post the link to it's location on their website in the country where you live. Go to their website and look for anything that has to do with the PCI bus mastering or switches. It's either a physical switch on the board or a setting in the BIOS.
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