Boot problems with RH AS 2.1 and SATA Maxtor hard drive
 

I have installed Linux Red Hat Advanced Server 2.1 on a Dell Optiplex GX280 with a SATA Maxtor Hard drive 6Y080MO but I have some boot problems.

I couldn't start the installation because of two "PCI-IDE: unknown IDE Controller" error messages.

Then in the BIOS I changed the "SATA Operation" configuration from "Normal" (default) to "Combination": this causes one of two error messages to disappear and I could install Red Hat.

Now Linux is installed but I can boot only in single user mode, otherwise during the boot I have a
"PCI-IDE: unknown IDE Controller" error message.

How can I fix it?