I have just upgraded MOBO/MEMORY/CPU and kept original hard drives x 2, CDROM and AGP Card. System will only boot maybe 1 in 10 times because it seems to have problems recognising the hard drives. I have checked cables and replaced with the cables that came with MOBO. I have upgraded to latest BIOS. Spec is: Gigabyte 8S648-RZ P4 2.53 Celeron CPU 533FSB 256MB Kingston DDR333 Hard Drives are Fujitsu MPC3084AT primary, MPG3204AT secondary. Any ideas greatfully received. Thanks.