A few possibilities but a quick google pointed towards......thats right.... PSU capacitors. Id been here before with a Samsung LCD.
The PSU board was slightly different to the one that the google result gave but the culprit stood out for all to see with a bulge on top and a little brown stain. (fitting in nicely with my last post about observational repair !)
Once pulled from the board it measured at 90uf and falling instead of the specced 220uf. Replacement in it was time to check....
Conclusion, poor quality electrolitic capacitors strike again. (well, its my first blog post to cover them but it wont be the last Im sure).
I would comment the monitor came apart particularly easily, I liked the design.