4threichjesusparty

So i'm running mandrake 9 now and i want to upgrade to 10. I download the 3 iso's and made cd's in Nero. I take the first cd,put it in, reboot, set BIOS to boot to my cdrom, reboot,and the mandrake install never pops up, it just boots to 9 like normal. I tried burning just the boot iso to a cd and doing it that way but that doesn't work either. I have a feeling i am just missing something simple. Any ideas?