I moved my pc which was working completely fine to a new desk. I unplugged everything, moved it across carefullly and then replugged it all back up. Now however, the monitor keeps saying no signal. I think the pc is working fine - all the fans are on, and the system is not blinking. Any idea what could have happened? Tried a different monitor and the same thing! At a loss, and am not a techy person so not sure what to do now.