Can't get into OSX after installation

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Hello,

I have installed mac osx86 before(rev.1 10.5.1) I erased it later but, I just try to say I installed before
But now I just get a flicking "_"
So I searched on the wiki and found:

[cite] http://osx86.wikidot.com/known-issues#toc3[/cite] Making Mac partition bootable Issue: After passing various installation obstacles, the bootload hangs at a blinking cursor "_" . Solution: Boot with the DVD and use -s at boot load. sudo -s fdisk -e /dev/rdiskX --->(X is the number of your HD, if you have only on its 0) update f X --->(X is the number of the partition where you installed Leopard) w q reboot Mentioned with Kalway release: the bootloader does not like seperate disk names. Use a single word as name.

But I did that and I'm 100% sure I did that right, but still it won't load OSX
Can somebody please help me