Problem with install on AMD Ahtlon 64

[ice]

Hello,
I try to install FreeBSD on my laptop and on beggining
after loader.conf has been loaded my laptop has been
closed automaticaly. I try to install FreeBSD 4.10 and
5.3 fori i386 and after 5.4 for amd64. In all ways
install has been brocked on the same point.
I try after to instal any linux OS and for linux
installation has ok.
Have somebody any ideas how can i fix this?
I realy want freebsd on my PC.

My configuration:
AMD Athlon 64 3400+, 2.2 Ghz
512 RAM
100 GB HDD
DVD-RW
NVidia GForce 440

Sorry for my english. Thanks.
ice

just ice..