I cannot get my iMac to turn on?

I cannot get my iMac to turn on. It was working, albeit slowy, but now it won't turn on. Any suggestions?

Please check the knowledgebase here to see exactly what symptoms you are facing
http://support.apple.com/kb/ts1367
http://support.apple.com/kb/ts1587
are you hearing the chime or something while starting

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