Tab 3 p5210 Won't power up

Hi
My Tab 3 was dead and wouldn't charge. I replaced the USB charging port. The tablet then charged fully. I turned it on and downloaded 4 movies. It was only turned on for about 30 minutes. After the movies downloaded, I turned the power off, now it won't come back on again. I have put it back on charge, there is no sign of anything happening.
I have tried the holding power button and volume up and down ect...and nothing.
Any ideas. ????

I have to mention, I ordered a new battery that arrived in a jiffy bag ! I did put the battery in but nothing happened , I thought the battery may have been damaged in transit due to the poor packaging, so I put the old battery back in. The old battery was in when it charged to 100%

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https://forums.androidcentral.com/sh...d.php?t=409154

Welcome to Android Central! The batteries might just be old and failing -- even the "new" replacement battery, which has likely been sitting on a shelf for several years.

Where did you download the movies from? If they were from a "free" movie download site, those are usually pirated (a no-no here), and more likely to carry malware.

You may have done a bad job of replacing the port, so it may be disconnected again. Check it. (Check the continuity between each pin and something farther down the line - without putting any pressure on the pin.)