cannot boot from the cdrom
My debian lost both top and bottom panel, then I tried to fix them by upgrade the debian from lenny to squeeze, somehow it failed, and the system stuck in grub when it boots. I have no idea how to fix it, so I gave-up and want to reinstall from CD, but now the debian-CD couldn't boot(Note: the cd-rom driver works, it will boot other OS CD), so it seems the problem is from the CD, I tried the CD on other computer, it won't boot either.
What I did wrong:
download the debian (small installation image) from debian.org
and then burn it on a CD-R