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Re: My Galaxy S3 won't turn on
You don't say if the screen shows the charging graphic when you have it connected to the charger.
You also didn't mention what model it is, or how old it is (perhaps sudden death syndrome?).
Finally, you didn't say if you tried Download mode (with the phone completely off, press and hold the Volume Down and Home and Power buttons simultaneously, and release them all when you see the Samsung splash screen).
You could try purchasing a JIG on Amazon - that's pretty much the last alternative to get the phone into Download mode. If you can get it in Download mode you can at least reload the stock firmware.
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