4 SATA hdds show as 2

[Deboo ^]

Hello,
     Linux Fedora Core 2 (Customer's PC so can't upgrade to FC4). Was
running fine till a few days ago. But suddenly, the 4 SATA hdds (300GB
each), show as only sda and sdb, the other two don't show. But all 4 are
detected in the BIOS. I tried booting using knoppix and all four show up in
fdisk -l but just not under Fedora. I tried insmoding the driver again but
that doesn't help. Mobo is Intel 915 GAV

Dmesg output only shows 2 hdds - /dev/sda and /dev/sdb

What could be the problem? Do I need to recompile the kernel?

Regards,
Deboo

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