It runs Win 7 Home Premium which in passing I have reinstalled from the HP onboard image, with a view to disposal. No hardware issues are indicated post install.
I thought that since the screen image is just about visible that it would simply be an issue of replacing the inverter, but no. I have just received and installed the second inverter from an Ebay seller with 100% feedback and it is still rather like me exceptionally dim.
What else could account for this? TIA