Stuck in soft brick cant access download or recovery mode PLEASE HELP

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http://forums.androidcentral.com – My Rooted samsung galaxy s3 will not boot up ,only shows the samsung logo i get into recovery for about 5 seconds and then it shuts off. same thing for the download mode ive looked around and can not find a fix any information would be helpful thanx! I will donate to anyone who helps my solve this** (HowTos)