hi!

I tried using 'vga=0 'at "menu.lst" of grub boot,it worked.
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title Knoppix511 from hda7 ISO cloop scan

kernel (hd0,6)/boot/knoppix.402/linux ramdisk_size=100000 init=/etc/init nomce lang=us vga=0 noprompt apm=power-off fromhd=/dev/hda7 knoppix_dir=/boot/knoppix.402 knoppix_name=KNOPPIX
initrd (hd0,6)/boot/knoppix.402/minirt_511.gz
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Now I can get rid of blank screen at booting on acer V72ma Motherborad,but the booting stalled at
"..check if image is initramfs...it isn't (bad gzip magic numbers),looks like a initrd"

what should I do next to boot into knoppix 511 normally?