Hi firstly my n900 when the slider is open, does not lock or unlock the screen and secondly when open the keyboard led does not light up.

any ideas?

The keyboard does not lock your device. To lock it, double tap the power button.

The keyboard (by default) will only light up when the ambient light in the room is below a certain level. Try opening your keyboard in a dark room

Ive tried that, im going to open it up and pull it to bits, there must be a problem with the slider sensor, when i open the slider the phone is not unlocked. I.E. it is still locked. I no this as well because when typing a text with the keyboard the first letter remains small, rather then auto caps.

In another thread ive read someone said a magnet fell out. i think that maybe the cause of my defect. id like to know what this magnet looks like if anyone has a picture, please show it.