Have used this disk many times with no problems. It works in another desktop. Have also tried, unsuccessfully, retail copies of XP and Vista.
Can boot, with no problems, from hard drive.
Downloaded new firmware for optical drive (Plextor PX-L890SA). Movies, music DVDs work fine in this drive.
Reset BIOS to default settings.
Set BIOS boot order to optical drive 1st.
At attempted boot,...
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