Why won't my Galaxy S3 turn on?

never had to turn my s3 off before, but had to a few tims this week. when i did the gray battery comes on and flashers all the time. when i try and turn it back on, it wont. i have to take battrey out for a few min's put it back in then turn it on. also iv even changed batterys and it still does it. any help please

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