When I switch on my computer a message comes up on my monitor 'signal cable not connected. also the keyboard and mouse have stopped working, I have tried another cable and monitor but to no avail. My computer is a desktop and it's only a couple of months old, before I call someone in I would like to know if there is a problem with the motherboard or the PSU, it was working fine before this problem, can someone come up with an answer please - Dave.
