I'm sorry I am confused... in your first post you said you had 4 SIMMs and 1 DIMM on your board. In your last post you said the board supports up to 256 mb SIMM and 2 DIMMs. (Don't you only have 1 DIMM?) Anyway I understand the SIMM... (max of 64mb in each slot, right?) So what is the max (in mb) that your DIMM will support? Currently, with both the SIMM in and the DIMM in, are you only getting 64 mb SIMM, and 128 mb DIMM? If so it looks like 128 is all you can get frm the DIMM. (So what is the total number of sticks of RAM you presently have--disregarding what type they are?) As for what jumpers you would have to mess with, there aren't any for RAM... all you can do with the jumpers if it isn't working right is set the JP1 jumper (or which ever one it is for CLR BIOS--it should say that right next to it) to CLR bios for 1 min (with computer off) and then jumper it back in the normal position. This clears your bios and sometimes fixes problems like this. (such as if you know your board supports that amount of RAM, and it just isn't recognizing all of it--otherwise it won't help if your board won't support that much, it just wasn't built for it.) I am going to look up some info on your board and try to straighten this out in my head.
-Mike