No screen for drive px 2 for some monitors

some monitors are recognized by the drive px 2 and some are not.
In the xorg.conf under the section device - allowemptyconfiguration is set to true.

Dear marwan.sabih,

Could you check the monitor cable? reconnect or change to another cable. Thanks.

Dear Steve,
thanks for your reply. Since the cable is working with other devices on the same monitor - i assume there should be another cause of the problem. Reconnecting i tried several times.

Dear marwan.sabih,

Could you please update/flash with new SDK? If you use old version. Thanks.