Look at the contents of the DVD that you have burnt. If what you see is a single file ending in .iso then you burnt this as a data CD when it needed to be burnt as a bootable image.
OK, that looks like it should be ok though I am wondering if it burnt correctly. The i386 DVD can only fit on a DVD-R disc but not on a DVD+R as it is slightly too big to fit. It'll fit on a dual layer disc of either format. Was yours a + disk perhaps?
wodim -v -isosize -sao -eject speed=16 dev=/dev/scd0 --overburn path to centos-DVD.iso
If the DVD was properly burned as an image such that you can see the directory structure, then burning again is unlikely to help. Sounds like a hardware/BIOS issue. Can you boot from other DVDs in the same drive?
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