Why is my phone opening then closing immediately?

[AC Question]

When I open my phone by pressing the power button, the lock screen shows up then after less than a second it closes again. I tried to test my battery if it is bloated but it is not. I tried charging it but nothing happens. How can I fix it?

 

[jeffhaskins]

Is it an LG? I saw this issue before on a friend's Lucid3. It actually ended up being viruses.