The problem could come from DVD-ROM. Toshiba DVDROMs with old firmware version have less compatibility with dual-layered DVD disc. Check out the following URL to determine whether your firmware is the latest.
http://perso.club-internet.fr/farzeno/firmware/
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PIII-550E@733/1.6v, P3B-F, G400DH/32MB@140/186
http://perso.club-internet.fr/farzeno/firmware/
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PIII-550E@733/1.6v, P3B-F, G400DH/32MB@140/186
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