Hello, so I got this gtx 770 pretty much for free I bought as not tested, so I pluged it in now and its not being detected in device manager , I got a fx 6300 so theres no onboard grapichs , also considering I own gt 610 I pluged that card into 2nd PCI E slot so like SLI ;D and the gt 610 works but the gtx 770 doesn't . any ideas what to do ? for the psu I got evga 600w 80+ bronze so I'm pretty sure its enough . .