Blinking cursor with MBR boot

[diz6]

my install works fine except i have to hav the CD in to boot into leopard if its not it i get the blinking cursor thing
i used MBR boot table should i try GUD

my specs
AMD athlon x64 +5200
nvidia 8800 gts 640mb
2gb ram
sata HD
M2n-sli deluxe mobo