Display goes black

[Jesse Johannesen]

Hi.

After tweak around and change parameters  , the unit is working fine .

Thanks

Hi Gilbran,
Some older versions of the firmware had a few graphical artifacts that come up occasionally, it may be worth updating your firmware. You can download the newest firmware from this post, get 1.1.070, but be aware that if you're upgrading from a version before 1.1.066 you'll need to do a factory reset after the update, which will wipe out your saves.
Instructions for updating can be found here.  
To do the factory reset press and hold [SHIFT+MENU] while powering the device, this will bring you to the global settings menu. Press the pad play pause button to factory reset the device, then press the panic button to continue loading.
Take care,
Jesse Johannesen