I have just built a Core 2 Duo system based on a P5B-E mobo with 2 SATA HDD and a single CD-ROM drive.
The system powered up OK and the HDD were recognised. However, I cannot get the system to boot from a CD-ROM in order to install windows. When I try to boot from the XP CD ROM I get the "Non system disc" error.
I have a Acronis programme on CD ROM and the system will run this from the CD Rom drive.
However, if I run an old win 98 start up floppy "with CD ROM support" when the OS Loads I get the message:
"Device Driver not found
No valid CD ROM device drivers detected."
And of course I cannot see the CD ROM drive.
I have been unable to access the ASUS support site so very grateful if anyone can point me in the right direction.
I have the p5b board and had to set the bios to boot from cd and then press a key when it said press any key to boot from cd. If I did not follow this procedure I got the same result as you. One other thing I had to do - my sata2 drive is a western digital and I had to download their disk set up software and let it set my hard drive up. Good luck.