Macbook Air 2012 Shutdown problem

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hi all! have problem macbook air 2012. os 10.9.5.
morning sound not working rebooted machine. , here problems start. macbook goes sleep mode after 5 seconds! , when so, have unplug/plug magsafe on. 5 seconds before shuts down again. have tried smc , pram resets. not able erase+reinstall because internett lost every 5 seconds due black screen. when pressed option+on button reboot menu screen didnt shut down. until clicked on recovery, started again. so, has had same problem? solutions? there connection no-working sound? extremely appriciated! :)

edit: new info: can still charge phone while screen goes black, if thats helpful guys.
 



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