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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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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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.
by oldturkey03
Apple iMac "Core i5" 2.8 27-Inch
by arguello47
Mid 2010
(i5-760)
Model- A1312 (EMC 2390)
2.8 Ghz Core
1TB (7200 RPM)
RAM 12 GB
VRAM 1 GB
by arguello47