Wireless Networking Troubleshooting Please Help

Devices:

PC-LAN

Laptop- wireless n x2 

Laptop- wireless g

Printer- wireless n?

iPhone 5c- wireless n

Oppo Find 7a- wireless n

 

Router/Modem Combo- Arris dg860

Service- TWC Turbo 20/2

 

Problem: Father claims he had no issues with disconnecting until I moved in. I have my pc connected over LAN and my phone the find 7a wireless N. Frequently, when he reboots his computer the laptop (Wireless G) will not connect to the modem. Even after resetting the wireless adapter it no longer connects. I have to reset both the modem/router combo and the wireless adapter in order for his pc to connect. He is running an old acer aspire one laptop with windows 7 starter.

I would really appreciate it if someone could help me figure out what is going on. I have no idea. I do have access to the router settings. 

Many (if not all) all in one modem/router/switch/access point suffer from being under powered.

What exactly is the nature of the problem anyway? Failure to connect, connection but no internet connection or connection but generally slow speeds?

He powers on his computer. And the adapter is on and ready to connect to a wifi signal, but you try to connect to our wifi and it says that it is not able to connect to the router at all.

Try switching your router to a different channel maybe your airspace is over saturated.  You can use free spectrum analyzers for your phone from the Play store to find a quiet channel.  If that dosnt help see if your router supports G only mode and try that his old card might be having trouble with MIMO signals 

Assign a static IP (ideally out of the DHCP range or if you can't, at the top end of it). See if the initialisation speed changes.

Is the modem routing at all? Some (cable)modems might be just bridges where the ISP is assigning only 5 IPs to your address.

Its TWC so it is likely a router and they only give you 1 Ip so its NAT for all the other devices. But its a good point he might have a 1 off setup from a legacy carrier that got gobbled up by TWC

Which device in the list is not connecting ... the laptop with wireless g?

+Edit ... 

Yeah ... I can read doh

I have had same issues with wireless G not wanting to connect to a wireless N dominated network myself.

 

Is the Router new after you moved in?

Try and power off all wifi N devices & power on the laptop and see if it gets on.

might even have to unplug (from router) your lan connected PC

Yea I bet if his router has a G only mode the problem will go away. ( I hope )

might have to get the old man a wifi N adapter

http://www.ebay.com/itm/USB-Wireless-Adapter-2-0-802-11n-g-b-2-4GHZ-150Mbps-Wifi-WLAN-Nano-Mini-/331213272462?pt=US_USB_Wi_Fi_Adapters_Dongles&hash=item4d1dd9758e

nice price

which combo modem router is it 

and who is your provider if it is Comcast here is a list of their devices

http://mydeviceinfo.comcast.net/

he has

Router/Modem Combo- Arris dg860

Service- TWC Turbo 20/2

that's not terrible ... i think wireless N adapter for dad ... like you posted

http://www.ebay.com/itm/USB-Wireless-Adapter-2-0-802-11n-g-b-2-4GHZ-150M...

 

already did this. I actually installed an access point in g mode only and left the other in n mode only and it fixed it.

It is routed.

So I fixed it guys. I believe wireless g/n was interfering with each other. So I installed an access point off of the arris in wireless g mode only and left the arris in wireless n mode, and gave the access point a static IP as well. This seemed to fix everything. TY for the help everyone.