hello i followed the guide: Installing iPhone 4 Power & Sensor Cable to replace the flex cable, as my power button did not wo...
After replacing the screen I was presented with a no image screen (but backlight was ok), so I refited the shartered one, same issue, no image, but backlight. thinking I might damage the pcb, I just did a power cycle (disconnecting the battery) and now it's fine.
so... always powercycle :)
There is a metal bracket that secures the connector, that will be removed before the conector is unfasten