First connect the "cat 5" cable to the dell's network card, the card has a square-ish hole with a little "cutout" in the top (for the cable's connector tab) the other end of the "cat 5" cable goes into the back of the router (you do have an existing router?) into one of the un-used square-ish holes (same cutout for the tab).
Then turn on the computer, see if the computer will "connect" to the router (that means it sees the router in computer-ish software).
IF that works then connect the router to the Modem (supplied by the "Internet Provider"... Then turn on the modem....
IF all goes well, your computer will now be able to connect to the existing internet.
Now for problems...
IF it seems to be connected correctly using the proper cat 5 cable, and it still will not work... turn off everything, start with the internet modem, then the router, then the computer... COUNT to 30 (1, 2, 3, 4... 29, 30) turn on the internet modem... count to 90 (1,2,3,4...90) turn on the router... count to 30 (1,2,3,4...30) turn on the computer... wait for it to fully boot, look down at the lower right of the screen and see if it can connect now.
IF it still doesn't connect, you may have to try another network card in the computer, or get a wireless USB "thingy" to connect to a wireless router...
Hope this helps...
SOURCE: need to upgrade memory in dell optiplex GX520
If you do not mind the trouble it would be best to unhook all cables and take it to a place like Best Buy and have them install more or larger memory modules, which most places do for free anyway. If you want to do it yourself then let me know. It is still fairly easy. Before you take it somewhere make sure and look on "My Computer" and jot down the exact memory first before unplugging it.
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