Alpine CDA-9830 doesnt want to work

Ok so everything seems fine. The wiring harness and everything is hooked up correctly. When i turn key on all i hear is a grinding noise. Like CD is trying to load,but i get no sound no visual no nothing. Possibly thought it might be a bad ground,but with a bad ground it might not even attempt to load. Any help would be appreciated. I dont think its a bad unit. I think something is wrong with the harness or something other . When i took the Alpine headunit out and put the factory back in everything worked just fine. So any help would be greatly appreciated