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Cannot turn my tablet on and it will not charge so i cannot turn it on no battery life

Samsung have issue if your battery is to week to charge . To fix this all you need to do is disconnect the battery and then reconnect then hook it to your charger and charge it . This guide will help with opening the tablet. Samsung Galaxy Tab 7.0 Battery Replacement Skip step 10 as your not actually going to remove the battery. Hope this helps

Your charging Port might be bad try to replace it.