It's an art of never arguing but presentation. Many will say it should be so but any maker has never done well. I suspect your issue if handled in the same manner would result in the same ending.
But here's an issue I see. Why would the machine be on with the lid closed? That's not a stock setting and certainly not how laptops are made to run.
I can see how they would deny this one.
I'm disappointed that defects thru no fault of the end-users are not covered by warranty.
My ACER Aspire 5600 notebook is only 16 mths old and has an extended additional 2yrs warranty. My notebook has began to show up several growing 50-cts dark spots on the LCD. Acer technician explained that keyboard panel get very hot and and the heat has caused the burnt-marks on the LCD. These marks are underneath the hard crystalbrite layer of the LCD screen. But Acer claims that these being burnt marks or imprints will not be covered by the warranty. BUT this is design fault! The manager also refused to accept my argument and insist it is a user fault! I felt robbed!
The proof of a product quality is in the after-sales.
Wonder if any of you experience same problems or with other manufacturers.