Hi Have just purchased 4 x 1 gb Kingston PC2-4200 RAM 2gb DDR2 533 MHz Memory, Non-ECC unbuffered KTD-DM8400/1G My Machine is a powermac G5 Processor is Dual core 2GHz, Memory currently installed is 3.5 GB DDr2 SDRAM. Made up of 6 matched cards, 2 x 1GB DDR2 SDRAM PC2-3200-u-266, 2 x 256MB PC2-4200U-444 and 2 x 512MB PC2-3200u-288 cards. Fitted the new ram cards and the machine didn`t recognise them, I know the slots are ok as the other cards work fine from them. Anyone got any ideas on what the problem is, the guy I bought them from said I had quite a different mix of memory and speeds and should reset the bios to get the board to rescan for the memory change. How do I reset the bios?