HP/Compaq D510 SFF, BIOS, boot from Compact Flash

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http://www.linuxquestions.org – I have bought three HP/Compaq D510 desktop units to use as servers: one at home, the others at friends' places, for remote backup, bittorent, running freenet nodes, etc. They seem ideal. Available for £30 on ebay. I have flashed the latest BIOS (2.21), added max RAM (2GB), SATA card and large SATA HDs to each of them. I am (trying to) use a CF card with IDE adaptor for the OS (CentOS minimal). This works fine with 2 of the 3 boxes. Although they are ostensibly identical, the 2 on which it works are "HP" on the factory barcode label, and the one on which it doesn't work is "C (HowTos)