So, decided to disassemble my Xbox 360 E first, before going for the harder Xbox One X. Cleaned the interior and exterior of all the dust(there was a lot, on both the fan and motherboard, surprise, surprise) and it did turn on initially, only to give me an error-screen. Only thing left to clean, is the power brick for that console, since I have been told if enough dust is on the fan/board of that, the brick will fail, and if it fails, the whole console does. Fingers crossed that when I clean that tomorrow, my 360 E works again, and I have that working, before moving on and hopefully fixing the One X, so that I then have two working Xbox consoles, because why not?