no signal

I've had my PC for about 10 years and as of today when i boot it up, i get 'No Signal' on the monitor and it just stays like that. This PC does not have it's own dedicated video card so i just use the on board ports. Motherboard - Gigabyte GA-A75-UD4 CPU - AMD A4-3400 APU RAM - 2 x CRUCIAL 2GB...