My wife's MacMini won't connect to the internet

We have a wireless setup working through an Airport Express - my iMac, my wife's Mini, her iPad, and an HP printer. Overnight her items stopped contacting the internet and printer. The message was "the WiFi has a self-assigned IP address" that is different from the IP address on my iMac (my connections work fine). By changing her IP address manually (to approximate mine) I got it to address the printer but still no internet. Some details:
My WiFi IP address: 184.57.150.132.
Airport Express IP and Lan address: 184.57.149.143
Her (former) IP address: 169.254.62.150
Her address (changed ) to reach the printer: 184.57.150.135
Complicating things: until yesterday the Airport Express was hooked through an old router we used for hardwired internet, thence to the Time Warner cable router. My Apple "IT consultant" son disconnected it and hooked AE directly to the TW router. My iMac apparently compensated for this with no problem (I have 10.10.1 OS). Her Mini is at 10.9.2 OS. With no internet connection I can't update her machine.
Any suggestions on how to reach the internet on her machine will be greatly appreciated.

My Apple "IT consultant" son disconnected it and hooked AE directly to the TW router.
Your son made a network error.. and you should tell him so.
You cannot replace a router on a cable modem without some careful setup.
I can see from your IP address that the Express is setup wrongly. It is in bridge mode.. it should be in router mode.
Go to the Airport utility.. you may or may not be able to reach the Express.. but if you can click on the device and then edit.. go to the Network tab and change the setting from off (bridge mode) to dhcp and nat.
If you cannot actually reach the express which is highly possible.. you will need to hard reset it. And you might be reluctant to do that without help.
Is the old router still a goer?? As an easy solution.. try putting it back into the network.. plug cable modem to wan port of the router and plug the Express to the router LAN port.. then you will need to power everything down.. wait say 5min and power up the modem.. then wait 2min and then the router.. another 2min wait and then the express. No luck try a longer power off on the modem.. say 20min.. it has to relearn what is connected.. ie the router and not your computer.
Or just ring your son.. get him to read the post and explain that your computer has captured the Public IP because the Express is bridged and it is a pure modem not a modem router.. the express therefore must be in router mode to work and everything needs to shut down and restart to get rid of the current dhcp lease on your computer.

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