Originally Posted by Blackberry_Poland
It is also possible, that you 've got a BB 8900 with not genuine housing, in which these buttons have no contact with the mainboard.
I tried it once and so was the effect (I bought a housing in Hong Kong, called "OEM Housing" ;)).
I installed in on BB. The upper buttons were no more active.
After opening I saw, that the middle part of housing above antenna has got no switches for the upper buttons.
well whenever u buy a face plate off ebay it does not come with the switches, u either have to swap from ur old one or buy new ones.
i am too having the same problem with my phone, but the mute/sleep button did work but not the lock. so i took apart my phone and inspected the contacts and pushed them down but did not fix. i did not thing anout maybe bending them out a bit to get more contact i will have to try that and let u guys know.