I tried to install Vista on my machine, I left during the installation. When I came back the computer was sleeping, I woke it up but the screen remained black, so I forced it to shutdown (yeah bad idea...). Since then, I'm not able to start it, not at all. If I push the start button, there's nothing, no leds. If I unplug and plug the power cable there nothing either.
Have I to change the power supply?