Nokia :: N79 Locking Phone Or Letting Back Light Shut Off - Device Won't Turn On

I purchased my N97 about a year ago and I absolutely adore it. I haven't run into any problems until last week. When I turn on my phone, enter the unlock code and use it to do whatever I need to do, it works fine. However, if I lock the phone or let the backlight shut off, it won't turn back on and neither do the lights on the number keys. Here is the funny part: If I press the power key (as if I were to change my profile) the backlight turns on, allowing me to see the screen, but the number keys don't light up! Does anyone know what I can do?

I'm not very tech savvy (so please don't laugh if my solutions are completely wrong), but here are some of the things I have done to try and rectify the problem:
- Let the battery drain completely and charged it in the hopes that it would rectify itself like it has in the past with other issues
- Took out the battery, SIM card and memory card just to make sure everything was inserted properly
- Restored the phone to factory settings