Hi last week whenever i shut down my pc the fans and lights would continue to run unless i switched of the mains power supply. Even i know this isnt a good sign,i had a quick nose around inside my system and the fans, especially the heatsink on my cpu was well choked with dust.So i gave it all a clean out whilst trying not to disturb anything too much. Now when i turn on the mains supply it starts running the lights and fans as before but when i press on the case power which used to boot it up, it refuses too. I noticed that on the back of my power supply theres a light which is amber when on standby,which is when i turn on the mains and goes green when i push the case power.It then proceeds to alternate between,green and amber. Does this mean my power supply has died or is it a symptom of something else? Can anyone help?