I'll try it when I get a chance.
In my case it was nothing but RAM and RAM alone. Try to obtain as much compatible RAM sticks as you can find in your environment and then experiment. Put one, put two, mix different speeds and different voltages if possible, fill all the slots, take one out.. and so on. Reset CMOS to make all settings auto before proceeding.
I can almost promise that bios will soon find a common denominator. Usually the slowest are the most compatible.