The iMac is Apple's line of all-in-one desktop computers.

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It will power on but powers off on its own

Do i need to replace my power supply or is it just the battery

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Identify your iMac a bit better. Best side for that is this site http://www.everymac.com/mac-identificati... It will help us to determine what hardware you have.

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Apple iMac "Core i5" 2.8 27-Inch

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Mid 2010

(i5-760)

Model- A1312 (EMC 2390)

2.8 Ghz Core

1TB (7200 RPM)

RAM 12 GB

VRAM 1 GB

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The PRAM will keep your mac from booting and I have heard of instances where it can charge long enough to boot then shut the machine down but I find that instance hard to believe. I would check the power supply out for a bulging capacitor. Something that once its warmed up will cause a thermal issue and fail . this is more likely the case but that said the PRAM battery is a cheap fix and if its not the problem your not out much money for a wrong answer. Have you opened the mac to know what your diagnostic lights are doing when it fails? Hope this helps

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