Hello all - 

I own a EAP-225 for my apartment to extend the wireless signal to my bedroom. I've had it for one or two years, and during that time it's been connected directly to my router, working flawlessly. However, I recently purchased a TP-Link TL-SG105 switch, and now it does not work after connecting it like so: router -> SG105 switch -> EAP-225. 
It works fine if I remove the switch and connect it again directly to the router, but I’d like to be able to use the switch. 

When the access point is connected via the switch, the LED lights do not come on, the networks aren't available, and the power supply for the access point makes a high-pitched whine. When I remove the switch from the equation, the access point functions as it should and the high-pitched whine is gone.

Any ideas? Is it possible those 2 products aren't compatible? Many thanks in advance.