Hi - good news... BIOS update worked. If anyone else has this problem, I downloaded v801 of the BIOS as a ROM file from the Asus website, then used their updater utility to install the update. Thanks to Crucial_Junket - RAM running smoothly, satisfied customer! For anyone in the same boat: http://uk.asus.com/Motherboards/AMD_AM3/M4A78LTM_LE/#download Select your Operating System first, then download ASUS Update V7.18.03 for Windows XP 32bit/XP 64bit/Vista 32bit/Vista 64bit/7 32bit/7 from the "Utilities" section. Then download the latest BIOS (v801 at the time of writing this) from the BIOS section, labelled as M4A78LT-M LE 0801 BIOS Unzip both files to your desktop, install the Updater, and then when prompted point it to the location of the BIOS ROM file (which should be your desktop if you've unpacked it there). It'll take you through the rest. Do a restart before installing new hardware. Worked for me anyway :)
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