Heres what happened - about 1 week ago my Power Supply Unit(PSU) started making a grinding noise... I ignored it planning on getting a new PSU as soon as i could. I wasn't having any problems except for having to always turn the pc on twice before it would boot up properly. Today i turned the PC off and then tried turning it on again a few hours later but nothing shoes up on the screen. There are a few clicks coming from the hard drive as soon as i turn the power on which didn't used to happen. Everything else sounds like it is working properly, But its hard to tell what is happening without being able to see anything on the screen. The PSU is still grinding. It is a 500W. I tried using my old PSU which is only 250W and the exact same thing is happening.(apart from the grinding noise because my old PSU is fine!) I am going to pick up a new PSU tomorrow and try that. Anyone know why this is happening? Could my dodgy PSU have messed with something ? Any help would be grately appreciated!