Blackberry Q5 keyboard lights up but screen stays black!

When I unlock my Blackberry (Which by the way I only got three days ago) when I haven't used it for 10/15 minutes, the keyboard will light up but it won't unlock? But if I press and hold the power button it will let me shut down or restart the device but it won't take me to the main menu, it either stays black or you get the shut down screen. Anyone know what's going on at all? It's annoying me because I love this phone, it's just this one problem!  Thank you in advance!

Try this:
Go to Home screen
Swipe down to get to SETTINGS
Select DISPLAY
Make sure brightness slider is at appropriate level-- I keep it a bit nore than half way.
Make sure ALLOW GESTURES WHEN LOCKED is ON
Make sure ALLOW POWER BUTTON TO UiNLOCK DEVICE is ON
Hit Back arrow (<) and close Settings.
<><

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