The more complete the description of your problem is (though it 's clear to you - you've omitted much crucial information such as what OS you're using, there's a lot of those, was the ISO verified as correct after burning? ) the more assistance we can provide, and, the sooner we can provide it.
Have you tried different media or using a slower burn speed -often useful in solving Optical Disk Burn/read problems.
If this answer is acceptable please remember to return and mark it accepted."
"How old is your DVD writer because after certain time or use laser lens becomes weak and it read only CD not DVD. Even it can't write DVD. So its possible that your written DVD was corrupted.
You can try to clean your lens with the help of lens cleaner which is available in the market.
Although if it is not working means need to change DVD writer."
