Monitor not working. I have assembled a P-III CPU and tested it at home on my Samsung Monitor, but

Question

I have assembled a P-III CPU and tested it at home on my Samsung Monitor, but when I broght it in my Office and tried to use it with an HCL Monitor it showed the initial display but after booting I could not see the display, it showed as it required Horizontol control (as were there in older TVs), What is the reson and is there any remedy?