Answer to: My Samsung Note II wont boot up and turn on/offWARNING!! I AM NOT RESPONSIBLE FOR BRICKED DEVICES. CHECK THIS BEFORE YOUR DO ANYTHING! If your device is stuck on the loading screen with the Samsung logo, you could have corrupted your entire operating system. If you want, you could download Odin and flash a fresh stock copy of Android onto your device. Make sure it is running the original carrier's version and is the right firmware Then, you connect your phone via USB cable to your computer and press down the volume down, home and power button for several seconds and the flashing menu should appear. Go back to Odin and start mounting your OS and yeah... Note: In this mode, you cannot use your screen and have to resort to the buttons.
Answer to: Why isn't my app store working?If the Play Store won't let you install apps, you could try going to settings and deleting the cache at the Applications Manager. If it still doesn't work, you could follow ZFix's way of reinstalling the Play Store.