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Have you done any configuration at all on the ActionTec? It almost sounds like you either have DHCP disabled and both the PC and the Apple are trying to connect with the same fixed IP address, or your DHCP pool is only allowing one address at a time. There are configuration options in the ActionTec to manage the IP addresses of connected devices, it is (normally) delivered to you with DHCP activated and I think up to 99 clients to attach (there is a fixed range for the TV STBs which start at 100 I think). If you do have DHCP activated, you might also release the IP addresses on one or both the PC and the Apple and let them try to connect again.
Other than the above, no idea. Any other info you can provide, like what options you have set in the ActionTec and what the TCP/IP definitions in the PC and the Apple are? (I know, lots of info, but maybe it would trigger something in your own mind or someone here if you can provide it).
Verizon FiOS TV, Internet, and phone
If you log onto the ActionTec and click on My Network you will see all of the devices the ActionTec knows about, and how they are connected and managed. I have three computers connected, one wired and two wireless, and three TV STBs; all show their connection types properly (wired or wireless), and show they use DHCP to get their IP address. For each computer you can click on View Device Details to see detailed info on its connection.
The DHCP management area is under Advanced (and Yes), then in the lower right of the screen under IP Address Distribution. Click on Network (Hone/Office) under Rule Name and it will show you how the IP address distribution is set up: mine has 192.168.1.2 through 192.168.1.254, allowing a bunch of devices to connect.
The business about wired vs. wireless connection for the laptop is strange, mine certainly does not show up that way. It may very well have something to do with your problem, but I don't understand why it shows up that way to begin with, or how you might go about correcting it.
Do you see anything else that looks strange? Maybe something inside the ActionTec is corrupted, perhaps a reset back to the defaults, by pushing the reset button, will straighten things out. If you have done any customization of the router you will lose it, but it isn't working very well for you now, so what would you really lose?
Verizon FiOS TV, Internet, and phone
IMG 1.6.0, Build 06.89
Click on Advanced Settings. DHCP is found under "IP Address Distribution". There you will find a Connection List of what has what address. Most should show up under My Network, but those that don't, will show up here. Perhaps the MAC is doing something strange. The connection is independent of the address being given. When the wireless connection is made, then an address is given. Just like plugging in a cable. If the addresss on the wireless PCs, or others devices are not dynamic you could have an issue with duplicates. I went in my DHCP settings and adjusted the range of what would be given out. That way it prevents conflicts. I set mine not to give out the first 10 addesses, this way I can use those for static address if I choose, and not get conflicts.
I am a PC
Don't buy a iMac. But its to late for that.
Just give them both different static IP addresses and see if that fixes the issues. If so that says there is a issue with the DHCP leases. I don't know much about macs. But I would say the way to go is put in some static.