USB port trick still working
For the boot issue, I did the following: (as mentioned above)
- Remove the keyboard
- Remove the LED board (unscrew 2 black screws on the back of the laptop)
- Remove the memory and keyboard plates
- Push down hard the lower left corner of the fan assembly (the thick metal around the fan)
- Try booting it on while pushing this part down
- I then unscrewed the screw at the top left of the fan casing and then screwed it down tight.
However, screwing down the top left screw didnt work so I replaced it with a slightly longer screw, if its too long it pushes the fan casing up and you can't reassemble but a slightly longer screw seems to exert enough pressure to allow the computer to boot.
All working now!