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.
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