Black Screen one week after installing new screen.

So all of a sudden my phones screen goes black after a week of installing a new screen, it seems to turn back on if I press the bottom half of the phone down hard, I know most people will say I didn't install it properly. But the thing is it was perfectly fine for a whole week, it wasn't until I performed a factory reset on the phone yesterday and now today I have this issue.
My phone just now wouldn't respond for so long until I help the power button and up volume keys for 30 seconds. Now it seems okay, but I assume it will go back to the same issue. The phone is also on as i can feel vibrations, it just goes black.