That link is just for reference.
-> This model appears to be deployed with SECURE BOOT which is also known as (AKA) UEFI. There are tomes about that but it's much more complicated to boot the CDs you listed with UEFI. It can take no less than 2 or 3 changes to the BIOS settings with a reboot with each change (I don't consider that progress!) to enable booting a non-UEFI bootable CD/USB/DVD.
I wonder if the HDD has failed to become very corrupt. We know that some malware is doing deep damage now (such as Conduit which I strongly advise you never research without using some other non-Windows OS.)
Try this. It looks to be in warranty. Let it be Toshiba's problem.
Bob

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