Question: I am attempting to get the following network to work:

BT Homehub (primary router, upstairs) <--- powerline (TP Link AV1200) -- -- powerline (TP Link AV1200) --> Sky SR102 (secondary router, DHCP off - downstairs)

I want the Sky router to broadcast wifi signal downstairs as a sort of "repeater." I have followed these steps:

* Change Sky IP to 192.168.8.10 (<https://sites.google.com/site/easylinuxtipsproject/second-router>)
* Switch DHCP off
* Connect Sky router to powerline downstairs via Ethernet

The SSIDs for both networks are not the same.The primary router's range is 192.168.1.X

Problem: Although the network connects and all powerline adapter lights are green, I am experiencing frequent drops in connection downstairs to the point where I either have to reconnect to the Sky's network or select primary router's network to connect. Speedtest shows the same connection speed as before. Changing the channels (6 and 11, 7 and 11, 11 and 11 - 1 is too crowded in my vicinity) didn't help at all. I have tried to set a constant ping to the primary router (read somewhere it could help with the drops) but it didn't change anything either.
I am also unable to reach the secondary router either by its new IP or factory IP address so I can't change its settings at all. 
Also not all of my devices will connect to the secondary router network.

Any ideas??? It feels like the two networks are cancelling each other out, but I don't understand why, I have tried to google the issue but came up emptyhanded.

EDIT: The default IP range of the primary router is 192.168.1.64 - 192.168.1.253

Thanks

Answer: 
A lack of GPU does not make your computer an Ultrabook.

An Ultrabook is a marketing term applied to computers with a particular size, shape, and weight, mostly.

When you got your laptop wet it may have damaged components inside the laptop. If the GPU itself is exhibiting unexpected/undesired behavior the damage is actually on your entire CPU die (the "chip") because that is where the GPU lives on your computer.

Based on your description of the symptoms, I'm guessing you're experiencing software issues not hardware. I may be wrong, but the delay between the damage and this issue and the nature of the issue seems to point in this direction.

What you should do is reinstall the operating system and get the latest drivers for your device. If things work OK at that point, then the issue was indeed just software. If you're still getting these issues with the integrated graphics not working, then the issue may indeed be hardware-related, and at that point it is likely that the cost to repair (replacing CPU and mainboard, at least) is higher than the actual value of the laptop.
You rare getting graphics on the display after booting into 'Safe Mode' because safe mode loads a very basic driver and does not enable your HD graphics whether on a gpu or MB. 

Sometimes something can go wrong with particular circuits in hardware devices (ie: Capacitors and voltage regulators can start to fail or some circuit paths shorted or non-functioning.) and the hardware chip or circuit can partially work. If Loading the HD graphics driver did not solve your problem, then starting over with a fresh OS install can eliminate the possibility of software related issues but if Ubuntu could not find the graphic then I would surmise a guess that a fresh Windows install would produce similar results

TL:DR version. Sounds like some kind of hardware issue and those are difficult to track down on laptops.