With an ISO file, you do not just drag and drop the files on, you need to find suitable software, to burn the ISO to disc.
A good program is Nero, just choose "Burn image to disc" locate the ISO image/file, and burn it.
When you have done that, put it in your CD-Drive, and reset your computer.
Is the motherboard touching any metal, directly that is? At any point, if it is, at some point, it will just be shorting out.