The most likely reason is the memory you have isnt compatible with eachother. If the types of ram are too different they often wont work together. If you google and download a program called cpu-z it will tell you what ram you have in each slot and you can see how different they are.
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THIS MAY BE A BOIS PROBLEM, THE SOFTWARE OPERATIONAL SYSTEM WILL ONLY ALLOW TWO 2 SLOTS TO WORK IN THE MEMORY CONFIGURATION, EVEN THROUGH YOU HAVE 4 BANKS, MOST LIKELY 2 BANKS WITH THE MAXIMUIN MEMORY OF 2GB PER SLOT FOR THE TOTOAL OF 4GB OF RAM NOT 4 SINGLE 1GB CHIP SETS. YOU SHOULD TRY IT.
Memory type is the major problem with the 741GX chipset. Very touchy. I used Crucial PC3200 High Density memory to start with (2 x 1 gig Memory), system was lagging even though adjusted settings in bios. whenever a USB device was pluged in, the system would stop responding. Switched to low density memory and no problems since (Ultra PC3200 (2 x 1 gig Memory), and the USB device problem is also solved. I am running WinXP with SP2.
It's generally not a good idea to mix sizes as your more likely to get problems, but that said it probably should still work it's most likely your configuration consult your motherboard book as to what order you should install the memory you have.