Why is my laptop not displaying anything, though it powers on?

I have a Lenovo T440 i7-4600U which powers on but doesn't display anything. I get a sequence of beeps (5 short beeps, a pause, and 5 short beeps again) and it goes quiet, though the system is still on. I've done the hard reboot (Take out the battery and charger, then hold the power button down for 20+ secs and turn on again) and checked for any faint lights. Also checked the ram. I think theres something up with the motherboard, but I don't know what or how to fix it. Anything would be very appreciated !