Thanks for your replies! I think i have the issue sorted - at least past black screen of death!
Just another variation on the factory reset in the end, ensuring it had been charged for at least 2hours:
1. Slide and hold down the powder button for 5 seconds to ensure the device has powered off.
2. While holding the Home button, slide and release the Power button while continuing to hold the Home button.
3. When the light on the eReader turns white and begins to blink rapidly, release the Home button.
4. Your Kobo Touch will reset to the out-of-box settings.
I guess the reset wasnt working before because of low charge or holding the home/power buttons too long.
Thanks again!