Invalid memory access on boot

[altern]

hi

i am on a powerbook 12" with warty, I did

apt-cache search kernel image
and then:
apt-get install kernel-image-2.6.X

and now i cannot boot. I get this error:

..
copying of device tree .. done
Initialising fake screen: NVDA, Display_1
Calling quiesce
returning 0x01400000 from promo_init
Invalid memory access at %SRR0 01403908 %SRR1 00083030
..

then i askes me if i should continue booting or shut down, if i continue 
then it goes white screen and nothing happens.

In the boot: if i press tab it just gives me one kernel to choose, the 
old one as far as i can see.

what can i do?
it was working so great ... depression ...

-- 
enrike