[Dahkid]

Try running Debug_SAMP launcher or just rename your GTA folder and see if that helps, other than that when the screen goes black try pressing "ALT+TAB" if that doesn't work then maybe you have to reinstall SAMP if it continues try reinstalling GTA: SA. That should do the trick ; probably just a mod or something bugging your GTA, before you reinstall GTA: SA if that step needs to be taken try adding a fresh clean GTA3.img file in your Models folder.