My phone won't past the logo screen

[jasmain]

I have a Samsung grand plus, and since yesterday my phone's been stuck on the logo screen. Then it will restart again. Before all that happened my phone kept saying "unfortunately your apps stopped." So i tried to restart my phone but then after it would come on it'd then freeze. When i restarted again it's now stuck on logo screen. I have tried the power, home and volume down button. But my computer won't recognize my phone.

 

[Rukbat]

Android is probably corrupt (and unless you've backed up your pictures, music, etc., you've lost it already).

Reflash the ROM - see [Samsung] How to flash Stock ROM via ODIN. (If it doesn't flash properly, or if it flashes properly but still doesn't start, the motherboard is probably gone.

 

[jasmain]

It shows me this: <OSM> All threads completed. (succeed 0/ failed 0)