Hello, I have a Asus A7A 266 mobo with AMD Athlon-PECM, 1200 MHz. I had one 512mb DDR dimm (PC266) and bought yesterday a second one. For some reason, it is not being detected. I shuffled the dimms around to be sure both DDR sockets and Dimms work: they do. The new DIMM is detected in both sockets, as well as my older DIMM when placed alone. But placing both at the same time only detects one of them. I flashed my bios so that it's now updated to Revision 1012. Anyone have any clue on what else I can do? Thanks, D.