try to reset the miner to the factory settings by holding IPbutton for 5 sec.
The IP Report button used "as is" doesn't reset the miner, it simply sends a DHCPDISCOVER message to your router/switch (whichever has the DHCP server ), sometimes the DHCP server fails to send a DHCPOFFER and the miner doesn't get an IP, but then the miner keeps waiting for the DHCP server and that can go forever, so this IP Report button sends another DISCOVER message in an attempt to get an IP address, but if you are already connected to the router and your miner has an IP address (OP said he set the pool worker and all that) means he indeed has an IP address and pressing the IP button for 5 seconds will do absolutely nothing.
With the being said, holding the IP Report button prior to powering the miner on without letting go for a few seconds after the miner has been turned on will reset the miner to it's default settings.
A side note: since APW3/APW7 don't have an on/off button this isn't exactly easy to do, you can hold the PSU still using your leg (knee/foot), use one hand to press the IP report and another hand to plug the cable in, of course if your miner is somewhere high this trick won't work.