Can't boot to Ubuntu iso DVD

[Douglas Pollard]

    This I am sure is due to my own recklessness. I had downloaded  
Ubuntu Studio 19 .10 doing video. I could see no advantage with it for 
video making over Ubuntu so I burned an Ubuntu 20.04 DVD iso and But my 
Hp  crashed when trying to boot and Run Ubuntu on top of Studio as my 
new operating system. I downloaded a new Iso Ubuntu file and it called 
for a Check sum. I had not done that on the first Ubuntu disk so I guess 
my first try was faulty. I down loaded a new 20.04 burned it but It 
would not boot. tried it several times. Reburned the dvd and still would 
run boot from it. So installed Ubuntu studio on an older Dell Optiplex 
and then tried to Install the 20.04 over it as before It did not boot 
the new 20.04 . Now that computer will not boot to any ISO DVD but will 
still boots to the 19.10 Ubuntu Studio that I previously installed on my 
Hard drive. Do you think I have corrupted Grub?   Thanks,  Douglas