How to judge whether or not a DVD-rom or DVD drive is faulty in my laptop?
To judge if or not a DVD-rom or DVD drive is faulty is not as difficult as to identify a faulty HDD. Mostly, if you can not use the DVD rom to record, or play CD discs, that 80% chance is due to a faulty DVD-rom, 20% of the chance might be due to a faulty motherboard. If you have a spare DVD-rom on your hand, you would try to replace it but being very carefully not causing damage to the connector on the internal motherboard. Otherwise, you should seek professional advice for this.