My iPhone keeps blinking ON every few seconds and then goes off by itself.

It started recently after the 3.0 upgrade.

How do I figure this out?

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76% accept rate
Did you ever jailbreak or unlock it? – Troggy Aug 19 '09 at 16:21
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closed as off topic by Nifle, Sathya Dec 18 '11 at 9:57

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2 Answers

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I would boot the phone into DFU mode, by following the steps listed here: http://www.iclarified.com/entry/index.php?enid=1034 Once in DFU mode you can reapply the 3.0 update through iTunes. I've used this process many times after failed attempts to jailbreak my phone. Good luck!

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Try to restore the previous firmware on your iPhone and then reapply the 3.0 update. If that doesn't solve it, I'd recommend setting an appointment up with a "guru" or whatever they call them at the Apple stores to have it looked at for replacement.

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