Okay, how did you partion or format the drive? What tools did you use (windows, linux install utilities, etc)
The best way to deal with this would be to get a copy of knoppix or some bootable CD or floppy linux and run that on the machine. You could show the results of
fdisk -l /dev/hda
to see what's going on. Then use fdisk to partition the drive.
Or if you plan on putting linux only on this box then most distros these days will to an auto fdisk and format and take all the drive space...
Some more details of what you did and what tools you used would be very helpful in helping here.
My appologies for the previous brief answer.