My computer won’t turn on? please help what do i do?

so i’m 16 and my 2008 imac i’ve had since 2010 wont turn on?? one day i put it to sleep and it wouldn’t wake up. i tried replugging it in and nothing! there’s no sound or anything in the computer. i tried opening it up and taking the hard drive out and throwing it away which still isn’t working. help?
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