I baught a PSP 3001 around January 10 and today, i was on the main screen and it turned to a really bright yellowish color. was it me or the psp. and how can i change it back???
the background changes to a different colour every month, if you want to chose a permanent colour, go to the settings and change the theme
Why did my psp screen all of a sudden change colors?
February 28, 2010 By 2 Comments

Maybe you dropped it? Save the reciept and exchange it for a new one. Thats what I would do.
References :
the background changes to a different colour every month, if you want to chose a permanent colour, go to the settings and change the theme
References :
http://www.devils-shadow.com/forums/psp-iso-cso-downloads/1732-every-eur-us-psp-iso-ever-released.html