KDS Valiant no image on on screen

first of all try to start your laptop in safemode
1 start laptop
2 continously press F8 key
3 when you see menyu select "start windows in safe mode"

if your computer starts with same mode and you see the desktop
then you just have to restore your xp with earlier system restore check point
and if you dont see desktop in safe mode also then you must have to install win xp again

steps for restore windows xp
1 start
2 programs
3 accassories
4 system tools
5 system restore
6 chose restore system to earlier time
then select any earlier date in calender at which computer is working properly
and click restore
it restores your xp and restart your pc and your problem will be solved

if still having problem then you must reinstall windows xp