9800 - Screen goes black when i opened the slider
 

Are you having this same problem?
When i want to use the physical keyboard and open the slider the screen goes black, i have to close it back again and keep trying

Re: 9800 - Screen goes black when i opened the slider
 

There is a thread in the 9800 section about your problem. See if you can find it.

When it happened to me, I kept opening and closing until it stayed on. Have not seen it on the 9810 yet.