It's a matter of finding a compatible video card for your machine. In all likelihood, your machine will accept a PCI Express video card. Choose what size you'd like, (unless you're a serious gamer who requires a lot of vid memory, a 256MB or 512MB card will do). Then remove and unplug cables from your Desktop and pull out the tower. Remove the cowl and blank so you can add your card to the appropriate slot. Once the card is installed, plug everything back in and turn the machine on. Since it's Plug n Play, your machine will automatically identify the new hardware. At this point, uninstall your previous video hardware in the Hardware Manager and install the new card either by downloading the driver online of if provided, use the disk that should have come with the new card.
SOURCE: ethernet controller
Here is the download page, you need to select model and OS: Driver & Download
SOURCE: No signal to monitor / Beeping
Listen to the pattern of beeps, or look at the back of the computer to see the pattern of the diagnostic lights ( 4 lights just under the keyboard/mouse connectors) and check out this site to see what they mean:
Beep Code Meanings
Diagnostic Light Meanings
SOURCE: Dell Optiplex GX280 Video Card Install Problem
You hit that one right on the dot. ATI website showed the specs for that graphics card you installed as needing a 300 Watt power supply. Good news though... I researched newegg.com and I believe I found your 300W power supply. There are 4 different Optiplex gx280 designs with 4 completely different power supplies. Since you bought the low-profile video card, I believe you have the slim computer case and this power supply should work for you...
http://www.newegg.com/Product/Product.aspx?Item=N82E16817374002
Good Luck
SOURCE: DELL OPTIPLEX 160L
It could be that the processor your trying to upgrade with is bad, try another CPU to make sure.
SOURCE: Dell Optiplex GX620 not recognizing PCIe video cards
If you have the PCIe card installed and boot the computer, do you still have video on the onboard connection? If so the two may be in conflict with each other. You may need to disable the onboard video card in order to get the newly installed card working.
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