New Ethernet Cabling, no connection

Hi,
I just had ethernet cabling done in my house from the router under the floorboards into my room which evidently doesn't work. Stupidly I didn't get the guy who did the job to check it and I don't want to call him out if it's just a software issue. He also installed a cable from the router into my parents room which works perfectly (have tried it with 2 computers). With these same 2 computers, the "network connections" "ethernet" flickers from "network cable unplugged" to "identifying" or "enabled" seemingly randomly every 5 seconds. It only stays on the "identifying" or "enabled" for a quarter of a second before going back to unplugged status.
So far I have tried with no success:
Changing cables (using ones which work with the other port)
Changing the router port
changing the ipv4 ip address to 192.168.1.20 and 225.225.225.0, leaving gateway blank (the DNS option also was switched to manual, but I left that blank, not sure if that might be an issue)
leaving all ipv4 info as automatic
Updating drivers for networks in "device manger" (nothing updated because it said my stuff was up-to-date)

Like I said I'm open to try any suggestions, the guy can't come back until next week so I'd love to try and fix this issue myself before he has to come back. I've tried googling my problem but found most people with this issue had it fixed by updating drivers or their network was previously working. I have no guarantee that the hardware he installed wasn't faulty.

Edit: plugging straight into any of the router ports works perfectly so i can rule out the cable, the router and (I presume) my computer.
Edit 2: Have now tried changing link speed to 10 full duplex (and all other possibilities). No success
Thanks for reading. My ipconfig all is below.

C:\Users\Will Smith>ipconfig /all


Windows IP Configuration


Host Name . . . . . . . . . . . . : elbershayz
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No


Wireless LAN adapter Local Area Connection* 4:


Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft Wi-Fi Direct Virtual Adapter #2
Physical Address. . . . . . . . . : 02-23-12-14-60-67
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes


Ethernet adapter Ethernet:


Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Broadcom NetXtreme Gigabit Ethernet
Physical Address. . . . . . . . . : 40-6C-8F-34-F2-30
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::6ce5:78fe:6966:6665%5(Preferred)
Autoconfiguration IPv4 Address. . : 169.254.102.101(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . :
DHCPv6 IAID . . . . . . . . . . . : 155217039
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1F-33-B0-EC-40-6C-8F-34-F2-30
DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
fec0:0:0:ffff::2%1
fec0:0:0:ffff::3%1
NetBIOS over Tcpip. . . . . . . . : Enabled


Wireless LAN adapter Wi-Fi:


Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Broadcom 802.11n Network Adapter
Physical Address. . . . . . . . . : 00-23-12-14-60-67
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : fdf4:dcf9:14b2:c600:bc92:cd7e:c26f:5c81(Preferred)
Temporary IPv6 Address. . . . . . : fdf4:dcf9:14b2:c600:284d:8b88:3197:d6b2(Preferred)
Link-local IPv6 Address . . . . . : fe80::bc92:cd7e:c26f:5c81%6(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.4(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Thursday, August 4, 2016 8:25:10 PM
Lease Expires . . . . . . . . . . : Friday, August 5, 2016 8:25:09 PM
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DHCPv6 IAID . . . . . . . . . . . : 50340626
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1F-33-B0-EC-40-6C-8F-34-F2-30
DNS Servers . . . . . . . . . . . : fe80::1%6
8.8.8.8
8.8.4.4
NetBIOS over Tcpip. . . . . . . . : Enabled


Ethernet adapter Bluetooth Network Connection:


Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Bluetooth Device (Personal Area Network)
Physical Address. . . . . . . . . : 00-23-12-14-60-68
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes


Tunnel adapter isatap.{4125CF8C-CE2D-45C9-BE4F-B125F9DBF833}:


Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes


Tunnel adapter isatap.{422F58AF-0813-4088-8512-E7F5F7DBC8A7}:


Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes


Tunnel adapter Teredo Tunneling Pseudo-Interface:


Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2001:0:9d38:90d7:46b:3f7c:3f57:fefb(Preferred)
Link-local IPv6 Address . . . . . : fe80::46b:3f7c:3f57:fefb%2(Preferred)
Default Gateway . . . . . . . . . :
DHCPv6 IAID . . . . . . . . . . . : 251658240
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1F-33-B0-EC-40-6C-8F-34-F2-30
NetBIOS over Tcpip. . . . . . . . : Disabled