If there is no reading of the disc then there is no laser scanning and the possibility that the laser head can be defective.
Try to clean the laser head unit.
If other DVD are working except bluray discs then above seems otherwise we must recheck with possibilities of a malfunction of the main processor board
No disc indicates that the optical headd unit is clogged or faulty.Now if the optical is working the data will be read , if not there is no laser scanning and the possibility that the laser head can be defective.
Now certain cleaner disks will not be tracked to run for cleaning as it is not read. Hence it will reject. So it is ideal to clean manually the laser head eye using a cotton bud with gentle pressure on the lens eye.
If not the optical head is faulty
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