What is the power LED status? Do you see any network broadcast from this AP, like Island.xxxxx or recover.me or configure.me?
Try the factory reset again and make sure you hold the reset button for 12 seconds. If AP is not accessible after factory reset by connecting a laptop directly to AP's eth port, there is nothing much left for the troubleshooting and AP hardware can be faulty.
Syamantak Omer | Community moderator | Sr.Staff TSE | CWNA | CCNA | RASZA | RICXI