If you can enter recovery mode, have you tried clearing the phone's cache? (Not factory reset or Clear Data, this would erase everything on your phone!).
Also try powering off the device, then holding power and home button together (don't let go) to turn on. If the phone turns off after this, then power+home again, then release power (but keep holding the Home button) until it finishes booting. And let us know if any of this helped
If you connect it to your computer, does Samsung Kies (or Smart Switch, although not sure it supports such an older model) 'see' the phone?