WTB - ReadyNAS NV power supply

Ah, that's an interesting co-incidence: yes, mine came from Overtek too. As you say, everything seems to be functioning correctly otherwise... but it's a bit unsettling that this remains unsolved. I haven't restarted the unit since powering it up (or touched the power button to illuminate the LCD), so I don't know whether it would give a repeat performance under those circumstances.
I did wonder whether the extra cables (I didn't cut mine off) might be putting additional pressure on the back of the LCD (I can't remember whether the chassis has a partition between the PSU bay and the rear of the LCD) - you know - that effect you get if you press your fingers against a calculator screen. But I don't suppose it's anything as fanciful as that. Besides, your situation is a little different in that you don't have extra cable jumble bunching up in there, so that pretty much counts that idea out anyway.