Can't get my pandora to work ...

Hi guys,

So I've found on ebay a refurbished PSP 2001 slim for only 75 bucks and ordered it. When I've got it I and checked that it was working fine, I've ordered a pandora battey from dealextreme. Slim, 3.5v 1200mAh.

So, I went into and tried to follow many tutorials but I can't get this pandora to work. No matter what I try, the results are all the same, memory card on, pandora on, psp power led goes green, black screen, nothing else happens.

I've tried NewbieInstaller, all 4 options and also PSP Grader, same results.

Also tried putting the battery holding the L trigger button, but it's all the same ... green light on, black screen, nothing else.

What am I missing?

I don't know what is the mainboard version, PSPIdent doesn't run ("corrupted data"), and I don't have the original box.

The stamp with the bar codes on the botom says:
AB025814194-PSP2001

On the battery place:
- Serial NO: HU2581419

It has the 5.51 firmware installed on it.

Thanks for your help...
[]'ss