Posted 27 April 2016 - 12:58 PM
Just to be sure: Is that CDRom listed in Boot Menu (probably F12 in the POST screen)?
Not sure what you mean by this.
To me it is strange that the HDD is listed as 3rd boot device which I certainly don't remember from past successful booting.
You don't always need to change the boot order in BIOS to boot from a different device (CDRom, USB Flash etc.). You also have the possibility to enter a boot menu using F12 key -or like this- at the very startup to select the boot device you wish. Sometimes, say an USB flash drive, can work well while you're in Windows. But you cannot select it as boot device in Boot Menu because it's not listed / detected. I don't know why exactly, but it happens. I have two 16GB Kingston USB flash drives. I can use only one of them as Multiboot Drive.
I burned those two ISOs on my newer PC using the Windows burning tool both of which were checked for errors. Previously on other jobs I have used Imgburn and CDBurnerXP when I had XP.
If you are sure, that two ISO CD's are burned correctly as an image, there couldn't be a problem with these CD's. I don't know if you was able to use these successfully, on your newer PC as bootable media. If not yet, it could be an UEFI / Legacy Boot problem. I don't have any experiences with UEFI thing. But you can read the following topics I've just found:
(Sorry, if my english is poor.)
Self-built PC, Lian-Li PC-A70B, GA-EX38-DS5, Intel Core 2 Duo 3GHz, Leadtek 9600GT, Kingston 4GB DDR2, Enermax Galaxy 850W
Selective boot (F12):
Vista Ultimate SP2 32bit, installed 2008, Samsung HD502HJ (500GB, SATA)
Windows 7 Ultimate SP1 64bit, installed 2016, Samsung 850 EVO (120GB, SSD)
Linux Mint 18.3 Cinnamon 64 bit, installed 2018, Intel 320 (120GB, SSD)