My pc keeps turning off and on after graphics card install.

make sure that the graphic card is compatible with your mother board
remove a blanking panel from the back of the pc and a side panel
find the correct slots for the graphic board and insert in into place
fix the end section in place to the pc using the screw
turn on the pc
if there is a cd for the card insert it , otherwise the computer will see the graphic card and set up the driver for it
if in doubt , get a computer shop to instal it for you

Did you install the drivers for the Graphics Card before you plugged the card into the computer? If not, remove the graphics card and reboot using your old video connection, install the driver then install the card and plug your monitor into the newly installed card. If you still have an issue try booting into safe mode.

1) Did you plug the monitor into the graphics card?

(Hey, happens! Sometimes in our zealousness to see what that baby will do, we mess up a little)

2) Did you install the Drivers? First?

These will be on the installation disk that comes with the graphics card.
Recommend installing the software from the disk FIRST, then turn the computer off, unplug from power, install the graphics card.

3) Does the graphics card require additional power?

Some graphics cards will not receive enough power, from the graphics expansion slot they are inserted into.

[Gateway GM5084 uses a PCI Express x16 slot, for best graphics.

http://support.gateway.com/s/PC/R/1009054/1009054nv.shtml

(Left-click on Specifications]

Some powerful graphics cards require additional power cables from the Power Supply.

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with your VGA card in pci slot locate the vga pci slot in our motherboard insert it firmly. Turn on the pc and make it sure that pc detects your new card and install the vga card driver supported by the manufacturer.

sounds like the monitor aint supporting the graphics card, do you see your boot menu when you turn on the pc, have you tried booting up in safe mode and removing drivers and restarting then installing drivers. try a differnt monitor, make sure your bios settings are corect for that card, hope these few things help

1/ first change motherbord on your desktop.if it is work (your old bord is damage ).then keep graphic card/ vj card on old mother bord slaut. if not work . it is seriously problem.mainly in pinless bord we can"t repair it. change or took it on export

If you're replacing the graphics card then it should go into the same slot as the one you are replacing. To do this, turn off the machine, remove the old card (if it's an AGP card they'll be a card lock on the inside end of the card where it plugs into slot). Remove the card lock, and then remove the card. Reinstall your new card. Keep in mind that your new card must be the same type as the old one AGP or PCI. The slots for these are different and you could damage the card and the slot.

no need to set or turn off the internal graphics card it is automatically disabled you install a separate graphic card either agp or pci express. Only you have to do is install the new graphics card and boot it up your desktop computer. After that insert the driver cd and install it.....just follow the user instructions,,,..

The chances are that you have an old motherboard which is not compatable with the new graphic card. Or you may be running windows 98 and are downloading the driver for xp or visa versa. The probable solution, will be to sell the new card on ebay and buy the best old card you can off ebay. Or just make do with the card you already had in your computer. If you are determined to have a better graphics card. A motherboard upgrade with better graphic card may be the best answer or buy a better spec pc second hand if you don't have much money. You'll probably waiste a lot of time trying to get the new card to work and it probably never will.