If you have any text editor this is too easy... Open terminal and change the file permissions for grub boot loader so that you can save changes to it :
Code:
chmod +rwx /boot/grub/menu.lst
menu.lst is the file which is responsible for saving the boot location, boot order and boot options including kernel arguments. Now open the menu.lst file from a text editor application and add acpi=off under appropriate section, and now save the file. Now again change the file permission so that it doesn't change automatically or by mistake :
Code:
chmod -rwx /boot/grub/menu.lst
Thats it, you're done...
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