Dear Ziad, I put the two 4MD DIMMs in DIMM Slots # 2 and 4.
1) I can boot now with no Error Code 48 errors
2) CPU-Z says that the memory is running in Single Channel
3) I went into the Bios and couldn't find the switch for accepting Dual Channel memory. Can u pls help me locate that witch.
Thank you for your help in this urgent matter>