i have a phillips 151ax lcd monitor which works perfectly with my desktop pc.  i loaned it to a friend who is builting a new system with the asrock alivenf6g-vsta m/b which has a on-board vga.   

during its boot-up, we could see the system specs and the ms xp pro logo flashing on the 151ax.  after that, the 151ax just turned black and we could not see a thing.   but we could see that his system is working with a normal crt monitor!

we downloaded the latest bios and drivers for the new m/b and the 151ax but to no avail.

where have we gone wrong?  thanks.