Re: Black screen and blinking underscore on Ubuntu Installation.
Do you have the right version for your architecture?
A 64 bit CD won't boot on a 32 bit machine, and an an x86 disk won't boot on a PPC.
If you've verified that you have the right disk for your architecture, and still have the problem, then it means the problem is that your CDRom drive can't read your LiveCD. Either you have a hardware problem with the drive, or the Disk is slightly damage, in a way that Your CDRom can't be read in your the disk, but other machines can.