Just had a quick look at the Mobo you are using
here if you are interested
http://www.intel.com/support/motherb...perl/index.htm
This looks like a fairly recent board ( early 2004 I think ) and you are trying to install an OS thats about four years old. So I would suspect that Mandrake 8 wont support your motherboard.
See if you can try Mandrake 10.0 or 10.1 or get your hands on a copy of Knoppix which runs live and if that boots then that could be the problem.
hope this helps
floppy