Hi,
I have a dual-boot system: Mandrake 9.1 and XP Pro. I had XP Pro first and then added a 2nd HD and installed linux on it. Everything was working fine until (Needless to say I learned the hard way) I tried to boot from one HD without the other...
I tried to remove the HD with linux and boot from XP only... I got a black screen with strings of "0101010101....." On the other hand I tried to remove the HD that has XP Pro on it and tried to boot from the Linux HD only I got just a black screen.
When I put the 2 HDs exactly as before, I could not boot from neither OS anymore. I still get the LILO prompt to choose an OS but when I choose one, it starts and hangs.
For Mandrake 9.1 here is the error message I am getting:
"KMOD: FAILED TO EXEC /SBIN/MODEPROBE -S -K IDE -CD, ERRNO = 2
MOUNT:ERROR 6 MOUNTING EXT3 FLAGS
KERNEL PANIC: NO INIT FOUND TRY PASSING INIT=OPTION TO KERNEL"
For XP I cannot even boot from "the last known good menu" or "safe mode"...
When I first installed Linux it did not give me the option on where to put LILO and therefore I don't know on which drive it is on... I don't have neither a boot disk for Mandrake, nor the original installation CDs and don't know if they would help or if it is the windows side that's messed up!
Before I mess up anything more can anyone give me some tips...Any help is appreciated!

Just a thought: Are you sure that you reinstalled the drive at the same point on the cable and didn't change the jummpers? In other words, that you have the same drive installed as primary:master and the other as primary:slave. I'm doing some speculation here but the original xp drive was probably the primary master and the second drive would've been either the primary slave or the secondary master depending on how your cd drive was originally connected.

Yes, Xp was on the primary drive and Mandrake on the slave...

I am trying to boot from a redhat 8.0 boot disk (is it ok when booting a Mandrake distribution?!) but it does not seem to find the kernel... All I get is a command prompt with "boot :" and I tried different commands:
grub
find /vmlinuz
find /boot/grub/stage1
root (hd1,2)
root (hd1,1)
etc....
For all the above commands I am getting this message:
"Could not find kernel image : filename"
Am I missing something?!

I believe at the boot: prompt you just need to hit <enter>