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HP Recommended

Hello I have a HP pro 3215 tower and use a dell flat screen monitor, the HP tower was running windows 7 until about 6 months ago when I downloaded windows 10, It was running fine with windows 10 but then I downloaded the EA app (to then want to download Sims game) and half way through the download of EA app the screen went black and a message popped up saying now entering power save mode, if u press the menu button on the monitor it will go change to auto detect digital input self test feature check with the red green blue and white colours, but now I cant attempt to do anything because the tower is now not registering my USB keyboard and and USB mouse! I know both are still working as I've plugged both into my laptop and they are fine so this is all the tower! I really need help to understand what is going on! thankyou in advance.

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