I looked up the Verifying DMI thing some more and it doesn't look good. There is no way for me to tell whether or not this is a hardware or software issue until you get this thing fixed. It is hard for me to tell what to do without seeing the actual comptuer, but this is how I would proceed.
Try Super Grub first, since it is the easiest.
Make sure all IDE hard drive and CD ROMs have jumpers set to cable select. (try booting and/or installing grub again)
Remove all hard drives but the one you are installing the OS. (try booting and/or installing grub again)
Set BIOS to defaults (try booting and/or installing grub again)
Clear the CMOS (try booting and/or installing grub again)
Remove everything not absolutely require for the PC to run, including PCI cards. Leave only your video card, one hard drive, one CD drive, keyboard, CPU and RAM. Something may be keeping it from booting. (try booting and/or installing grub again)
Upgrade the BIOS (try booting and/or installing grub again)
I'm kind of thinking out loud here, just putting down my thoughts and maybe you will get some of it and help everyone understand the problem... A computer freezing at verif DMI is most likely a hardware or BIOS issue, but the fact that you can boot to the live disc points more towards a software problem, though if it were only a software problem you should get some sort of response when booting to the hard drives fail, like the "Failed to boot disk, please insert disk and pres ENTER." It is possible that it's starting and handing control of the computer over to an MBR which is then locking up and preventing anything else from being displayed so in short, completely eliminating hardware or software is impossible at this point. I would count anything showing up after verif DMI a success, even if it's a "Failed to boot disk." Getting a fail to boot disc at this point would mean you either A. fixed a hardware problem or B. removed something that the computer was unsucessfully trying to boot to and locking up on. hmm...
Try as much as you are comfy with of the list above. Only upgrade your BIOS if you are sure you know how to do it, I feel rather skeptical about listing it at all because it is so risky, but if all else fails it could help. Sorry this isn't an easy problem to fix.