My brothers computer wont start up & high pitch noise

Well my bro moved out a few weeks ago, i just talked to him and he said i could use it. Although when i started it up i heard it starting and everything was fine until 2sec after it started up.. It suddenly just stopped and shut down, like as if the electricity was taken off. I tried starting up again but the nothing happened. I opened the case and checked that everything was plugged in, and it was. Then i checked the electricity wires and the switch at the back. The electricity input wire at the back was quite loose, so i pushed it further in. Still though no starting noise and no fans started. The weird this was that when i switched the switch at the back "on" after turning it off it made this weird high pitched noise.
Also smelled a bit like dust, lots of dust, a bit burnt maybe as well, i am not sure.
I dunno if it normally makes the high pitched noise, but anyway PLEASE answer
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More about brothers computer wont start high pitch noise
  1. sounds like psu had died try unplugging psu from motherboard hit the on switch. then plug psu back in and turn on again see if that will do anything
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