Loading forever

Hi, when I turn on my psp, it appears that thingy, saying Sony Computer Entertainment and then when it was suposed to load the theme, it doesn't, like it just stays there loading... I have tryed to run it without the memory stick, I have a couple of ISO's in there, its still the same error the only thing I can do is press 'select and it appears a "m33 vsh menu", so, please, if you can think of anything that it could help...

Try this :

1) Turn off psp.
2) Hold "R" and turn the psp on.
3) Select "Advanced" from the recovery menu and press "x".
4) Select "Format flash1 and reset settings" and press "x".

That might work for you :)