TS1440 When I start my iMac it chimes, whirs and then dies.

When I start my iMac it chimes, the fan starts whirring and then, five seconds or so later, it dies. The iMac is about six years old. And fixes? Thank you.

Welcome to Apple Communities
http://support.apple.com/kb/HT3964?viewlocale=en_US
Take it to a reseller or Apple Retail Store

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