So I recently went and looked at this system: Code: AMD Athlon X2 5000+, ECS motherboard (PCI-E 16x &1x, 2PCI, mATX, DDR2), 1 gig ram 667, 160gig maxtor disc and generic dvd drive The thing works fine aside from the fact that it refuses to boot or install on/from internal drives. The drives are detected properly in the BIOS and are also readable (and possibly writeable, although formatting was a bit glitchy) when booting knoppix from USB stick. The hard disk runs as it should in other systems; the drive isn't defective. Running the install from win 7 via USB gives a slow boot and then the error that additional drivers are required to install. The hard disk is however already detected properly but apparently still not seen as installable. Adding the drivers for the nvidia sata/ide controller during install still provides the error (the drivers are installed without problems though). The system runs memtest without problems (2 passes) and as said knoppix runs fine too. I'm planning on adding a PCI IDE controller I have lying around to rule out the sata/ide controller (assuming it's bootable, haven't checked that yet ^^). So I'd say CPU is fine, mem is fine, hard disk is fine, PSU is fine --> what's broken ?