Grub load error 18

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http://www.linuxquestions.org – hi , its rohit I have ubuntu 9.04 ultimate edition 2.4 ,I am getting grub load error 18 from many days .. how can i get rid of this problem .. i used to remove the jumper & CMOS battery of motherboard whenever i got this problem ,but now even that is also not helping .. for some 2 days there wont be any problem & then the problem again repeats ... please help me .. thank you (HowTos)