boot problem

Hi and thnks for your inputand help
My sons pc :
xp pro
amd xp 2000
512mg
ati gforce 4 mx440
octec mobo
Problem:
when starting pc everything works fine until last sequence when pc boots user names.
That doesnt hapen screen goes black and stays like that.
When i restart and go to last good configuration nothing hapens same thing occures.
I can start only in safe mode.
I run adaware and spybot in safe mode.Same thing happens.
I have changed video card -same result.
Didnt try lot of things cos have few pc in the house and he doesnt depend on it but i tought to post so get few suggestions before i resolve it.
Didnt go to far with system restore.
OK
My next move is to do sfc /scannow and see if that solved problem.
What would you suggest if that doesnt work?
thnks
Pc was working and boting normaly.I think he may done something with downloading games orplaying but dont think so as i set him up as limited user.
thanks

I had the same thing happen once before... Downloading and installing the latest display driver solved it for me.. Had to boot to safe mode so I could see something and install the driver.. After a reboot everything worked again.. You might want to give it a shot..

Do you get the same problem if you set Windows to boot in "classic mode" (the prompt for user name and password) rather than from the list of user accounts?

:)

i have the latest drivers.
i tried to roll back driver.i changed video card and updated driver nothing changed which eliminate video card i suppose.
Window boot with list of names nihil never tried to boot in classic view.

One other thing that might be an issue.. What's the Refresh rate? It might be set to high for your monitor.. Boot to safe mode and set it to a lower frequency..