Answer Best answer as chosen by user frenchdragon
You have two slots, is either one open?
According to crucial.com your Dell 2400 have two memory slots.
If you are already using both then you will have to remove one, and replace it with another containing more memory than what was there.
If you are only using one, then it is easy enough to just pop in another card that will increase your total memory.
Also, according to crucial.com, your compatible memory is DDR (Double Data Rate) type, and you can either use PC2700 (speed 333MHz) or PC3200 (speed 400MHz). The PC3200 is the faster (just a bit faster) than the PC2700, but if you are using one of each then the whole memory will be the slowest of the two. So, if you are replacing one there is no advantage if you are adding a PC3200 when the remaining one is still PC2700.
IMPORTANT!! Do not do any of this installation with the power on!
If you are a fumbling type of person you might want to ask somebody who has installed memory show you how to do it. It is not hard, since the slots are keyed and you should not be able to install the memory backwards. Plus, also being keyed, the wrong type of memory will not fit in the memory slots you have. But, and the reason I asked if you were fumble prone, I have seen some people try to force the memory into, or from, the slots.
Remember, this is supposed to be easy. It only requires a slight tilt and move of the memory card while releasing a small "lever" on each side of the card. If it does not move easily, you are probably doing it wrong.
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