You may have jarred something else loose as well, try reseating all off the cards, especially the video card. If there is only one beep that's supposed to signfy a normal POST test. (Would you believe that the beeps were actually an audio troubleshooting code way back when?)
You'll also want to check the connections on the back of the tower and make sure that all the cables are secure, again paying attention to the monitor cable.
If you have a can of air it wouldn't be a bad idea to remove the expansion cards and the RAM, shoot everything clean, and then reseat them.
As for DIMM it means Dual In-line Memory Module, and refers to how the chip handles instructions and should not have any connection to the physical setup of the chips or boards.
The last thing to consider is that there are quite a few SDRAM chips that only run at the 133 MHz speeds (the PC133) and if your board only supports 100 MHz (PC100) then the chip will cause the bootup process to fail, but if you've already tried it with just the older module that shouldn't be a concern.
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Halfway to hell and picking up speed.
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