Up to the other day my external monitor worked no problem, the laptop sees the monitor but on my external monitor it just keep coming up "no input signal" and going into stand by and I have tried other monitors and other vga leads its a dell latitude e5510, help!
sounds like input mode was changed on the external monitor. The monitor should have an input button. Just hit it once and wait a couple of seconds. This should switch it to vga mode (probably on hdmi right now)