Ok, then reboot your MCi500H and let's see if it gets an IP address then.
Reboot it be, when it's powered on, press and hold the power button for > 5 seconds to enter "Eco Standby Mode". Then wait 15 seconds and power it up again and when it's back on, check it's IP address (Menu, Information...).
I rebooted the MCi500, got the IP Address - 192.168.0.3, tried pinging but "ping request could not find host".
The only two things that I know can cause this behavior is a Firewall in your PC. Please double check if your AntiVirus system has a Firewall that is still enabled.
The other is some strange setup including a WiFi range extender.
I'll see if some more idea pops up in my head during X-mas, time to play with the kids now ;-]
Cheers & Merry Christmas !
Thanks very much for your help so far!