If I may suggest an ordered troubleshooting list:
1. Identify the switchport that the AP should be connected to.
2. Verify the switchport's config. If it's good, continue on. If it's misconfigured, fix that!
3. Connect a known-good device to that switchport. Do you get the connectivity you expect? Assign a static IP address if necessary.
4. If the switchport is good, start changing cables one at a time in between the switch and the AP. Make sure you know these cables are good.
4a. If there's a power injector involved, swap that out too if you can.
5. If the switchport is not good, configure an empty switchport to match the settings. Check it using your known-good device.
6. If the new switchport works on your device, connect your AP back in.
7. If AP comes up, victory! Otherwise, do steps 4 and 4a.