[other] Power supply issues

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http://ubuntuforums.org – Hey there, first off, I am not sure if these kind of questions can be asked here, let alone if they are on the right forum board. Please tell me if I would be doing any wrong with this post. To describe my problem, yesterday I started a download on my Ubuntu 11.10, but when I came home, I found my PC switched off, and was not able to start again. I know it cannot be a software problem though. Instead the power supply made a very high-pitched noise, and did not want to start the computer. I disassembled the whole thing, although I could not discover any problem. Sadly I have not other power (Hardware)