That's some strange configurations. Are you mixing 1 GB and 2 GB modules? What exactly do you have? It sounds to me like you've got 3 1 GB modules and 4 2GB modules, but I could be wrong.
Second, what make and model of memory is each piece? They all have their own oddities, and there are people here with enough experience to tell you what to do based on the type of memory. If you have double-sided memory, this will not work with that board:
Do not populate both DIMM sockets of the same channel (e.g. DDR and DDR2), or populate 4 DIMM sockets with double-sided memory modules to prevent system's failure to start or incorrect detection of memory modules. Please refer to the user manual for the memory configurations table.
Third, can you test with two of your larger modules (remember I don't know if these are 2x4GB or 4x2GB) in DDR1 and DDR3, and again with them in DDR2 and DDR4, so we can see if it's a slot problem?
Fourth, bear in mind that using DDR2 and DDR4 slots slows down the memory ("when the DDR2_2 or DDR2_4 socket is populated with a DDR2 800 MHz memory module, the memory speed will be downgraded to 667 MHz"), so your ideal config might be 2x4GB in DDR1 and DDR3.
Looking forward to more details. If you could tell us which slots are populated in the above configs it would help, too.