SLED10SP2 : No Signal on Monitor

[solokacher]

My video card is 7300GT
I got SLED10-SP2-DVD-32bit installed
Then I installed NV driver(173.14) with yast2
Reboot....After loading for a while, My LCD show "no signal"
BUT if I just type username + enter + pwd + enter,
I can hear the Logon music !!

Then I got into FailSafe Mode , recover xorg.conf , log on xserver successully, then run "nvidia-xconfig", reboot,
LCD show "no signal" again.

recovered xorg.conf again, I tried the "NVIDIA-Linux*****.run" .but it did nothing difference.

How could I solve this problem plz?

P.S.
if i simply replace (driver : "nv") with (driver: "nvidia") in the file xorg.conf, the same problem will happen