Help! My mac 'Pops' off at switch on!

My white un-web cam iMac takes four attempts to start up, making a 'pop' noise when failing, but then works well although can 'pop off' when woken from a long sleep.

Is it a bad power unit?

Please help!

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Yes, My first guess would be the power supply. Lay it down flat on its screen.. remove the back.. usually if a power supply is "popping" it will have a distinct smell.. also looks for any buldging or swollen capacitors.

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I'm pretty sure it's the power supply because the original power supply that comes with this model is notorious for failure after long use.

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Could be, but could also be a bad hard drive, use disk utility to verify your hard disk if that's failing, a failing drive can make popping noises.

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