What exact model of HP is this?
Do you know what video card is in the system?
Did you burn the cd disks correctly? See my article located
here.
If you did burn the iso images correctly (used a low burning speed, are using quality disks, checked the md5sum of the iso images), try typing in at the boot welcome screen via the command line;
linux noapciThen hit the enter key, rather than just accepting the default.
The other option to try is;
linux acpi=off