My Dell M110 projector keeps saying "No Signal"

My projector stopped recognising my devices and keeps saying "No Signal". The HDMI cable works and it turns on and everything, however it just wont find the signal. I have also tried switching to different Sources, it keeps saying "Searching for Signal" but doesn't find any. What do I do? I have also tried to see if it was an issue with my laptop but it isn't.