June,The Dell Dimension 4100 Desktop PC, utilizes an AGP slot on the motherboard, for a graphics card.
http://en.community.dell.com/support-forums/desktop/f/3514/p/17152514/17275500.aspxThere are different styles of AGP expansion slots.The one on your motherboard was the last current style of AGP -AGP 8XTherefore your Dimension 4100 uses an AGP 8X graphics card.It is (Was) an Nvidia GeForce FX5200 graphics card, and the AGP 8X style.
http://en.wikipedia.org/wiki/AGPTo replace it just use a graphics card that is AGP 8X, and is better, or equivalent to the GeForce FX5200.You also need to know that your Power Supply in your computer, will handle the power requirements for the computer system, AND your new found AGP 8X graphics card.Power Supply was rated, at a maximum Wattage rating of 200 Watts.Problem is; that back in the day when the Dimension 4100 was made, the Power Supply manufacturer 'Fudged' the real Wattage specifications.Power was (Is) more like 60 to 70 percent of what is stated.Divide 200 Watts by 10= 20Now take that times 6, for 60 percent.= 120 WattsNow take that times 70, for 70 percent.= 140 WattsACTUAL power
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=4410189&CatId=2234I would recommend this one, but it requires 250 Watts MINIMUM,
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=853908&CatId=2234[Graphics card manufacturers, base the Minimum power requirements for their graphics cards; based on a test computer system.So the Minimum power requirement stated, is not only for the graphics card; but ALSO the rest of the computer.The test computer system is usually based, on all of the top of the line, power consuming hardware components; of that timeTop of the line powerful Processors, and Motherboards.Add to that the maximum amount of Ram Memory, that can be used.Two optical drives, (CD/DVD drive)Processor fan, and at least two computer case fans ]KNOW THIS:A) FOLLOW Anti-Static ProceduresYour body carries Static electricity. Static WILL fry out (Short Circuit), the delicate hardware components inside a computer.Relieve your body of Static BEFORE reaching inside your computer, and BEFORE taking any new parts out of their Anti-Static bags, or cartons.Computer on a table, computer Unplugged from power, computer case open;TOUCH an unpainted surface, of the metal frame of the open computer case.This action will relieve your body of Static.IF, you leave your computer in the middle of working on it, be SURE to Touch the metal frame again upon your returnB) Windows running on your computer, PUT the Installation disk that comes with the graphics card, in your optical drive tray.(CD/DVD drive)Install ALL software.There will be Drivers you are installing, and also a graphical user interface. (GUI)The GUI for an Nvidia graphics card, (Evga GeForce 6200 is an Nvidia card), is the Nvidia Control Panel.(For ATI it's Catalyst Control Center)Driver: Small piece of software that allows the Operating System to communicate with a deviceIn this case the device is the graphics card.What version of Windows operating system was not stated.-> AFTER <- you have installed the software, and if it asks you do you wish to restart your computer; the answer is -> NOClose all windows, go back to your desktop screen.Now turn the computer off normally.Follow Anti-Static Procedures, and Physically install the graphics card.Note*The AGP expansion slot on the motherboard, will have a type of Locking Arm on it. With most the end of the arm, has a 'fingerdip' in it. Makes it look as though you press DOWN, on the end of the Locking Arm, in order to release it. (Unlock)Actually you GENTLY pull up a little on the PLASTIC Locking Arm, to release it.Release to remove the old graphics card, and to install the new one.After the new graphics card is installed, attach the monitor cable to it, and close the computer case.Turn the computer on.You MAY have to go into the Nvidia Control Panel, and set Screen resolution, and other parameters.(Look up your monitor by it's manufacturer name, and model number. {Back of monitor - Model Number}See what the Screen resolution is.Example - 1280 x 800 pixelsSet Color quality to High (32 bit)Have additional questions please post in a Comment, or Reply.(Below my solution)[When a device is installed on a computer with Windows, Windows will 'break it's neck' to find suitable, matching drivers.If THE drivers are not there, Windows will match up one of it's THOUSANDS of generic drivers.This = NOA Driver Conflict can result.Windows: "Which drivers do I use? These or THESE?"With THE drivers installed first, Windows will find them.