Solved "Ethernet" doesn't have a valid IP configuration

You have probably heard this problem a lot of times and it have bin talked about in a lot of forums.
But after searching and trying almost every posable fix I could find, nothing would fix the problem ""Ethernet" doesn't have a valid IP configuration".
After playing a match in "League of Legends" with my desktop I noticed my ping went up and I disconnected right after, I looked at my network icon in the taskbar and saw an yellow error mark. I clicked on the network icon and it said "Unidentified Network" and "Limited". I tried to troubeshoot the problem and the problem found was: "Ethernet" doesn't have a valid IP configuration. I ran ipconfig with the cmd tool and I noticed Ipv4 Adress was 169.254.171.146 (As ive heard that means windows is using a default ip by itself).
I have a lot of devices in my house like laptops and smart-phones that work perfectly good.
One thing that did work was sharing 3G internet from my iPhone to my desktop via usb.

Solutions tried: Resetting router, disabled the "allow computer to turn of this device to save power" in ethernet options, tried different cables, restarting pc and updated drivers (installing the driver to a usb from my laptop).

I hope someone will try to help me with my problem. Thank you!

That IP address is usually the result of the system not obtaining one from your router. Are you hardwired to the router and have you checked for loose cables? If the cable isn't clicked into one of the ends, it could loose your connection. Also, if you have an extra empty one, try a different router port.

There is no loose cables and I have tried different ports in the router
Thanks for reply

wait, delete the whole post. I solved it by plugging in and out all cables from my router. And the internet just worked. I will mark this as solved ty

I have same problem connecting to Wlan here is what its says when I tried to use IP from Cmd
Microsoft Windows [Version 6.3.9600]
(c) 2013 Microsoft Corporation. All rights reserved.
C:\Windows\system32>ipconfig
Windows IP Configuration

Wireless LAN adapter Local Area Connection* 3:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Wireless LAN adapter WiFi:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Ethernet adapter Bluetooth Network Connection:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Ethernet adapter Ethernet:
Connection-specific DNS Suffix . :
Link-local IPv6 Address . . . . . : fe80::e519:f486:cd88:2938%3
Autoconfiguration IPv4 Address. . : 169.254.41.56
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . :
Tunnel adapter isatap.{3295BF9E-4B58-4DAF-93D4-9EB464C8175F}:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
C:\Windows\system32>

Pls can anyone help with this? It is really give me sleepless night.
Thanks