My iphone is broken and has an occasional blue screen?
I have an iphone 4 (not a 4s) and 10 minutes ago it was completely functional. I set it down to give my cat some food. I saw it had a black screen because the light was off and it was glowing. I pushed the home button but nothing happened so i rebooted and there was a white line. Then the apple symbol flashed and it had a black screen. Then after a few moments the screen turned blue. Only for a couple seconds. The cycle repeats and 5 minutes later my phone is still trying to turn on. It is now making faint sort of crackling sounds. The screen has 2 cracks but its been like that for a year now. Does anyone know what's going on and how i can fix it?
Added (1). its just having a black screen (which is on) and its still trying to attempt to turn on