installing new kernel crashed X - Help

[Micha Feigin <michf@math.tau.ac.il>]

I tried to compile an install kernel 2.2.10 on a 486dx2.
It compiled correctly, but when I tried to install it it wouldn't start
(halted with a message that it was trying to open some module and couldn't
find it, and then that it couldn't mount root file system on 03:01.)
I rebooted with the old kernel (a localy compile 2.2.5).
I then tried to recompile 2.2.10, reinstalled it, but it still didn't
work(same error).
When i went back to the old kernel again and login into x, when i tried to
log as a normal user, the screen would go blank and then throw me back to
the login prompt (kdm). It did let me login as root.
On the text consoles (not x11) i can log in as a normal user.
What did I kill?
All i changed was the kernels and lilo (at list as far as i know).
If it helps, the compilation over filled my hard disk (it showed 0 space
before starting the compilation)
The second, the one that crashed the system, I didn't clean the kernel
source before rebooting.
Thanx
michf@math.tau.ac.il