To dark sony ericsson W880i my phone flashes light then dark and then it stays dark i can still see the number its just to dark.

Hmm.. Your cellphone Leds could be broken.. :/
Try pressing the following keystrokes (and joystick for left/rigth):

Right, *, Left, Left, *, Left, *.

A new menu should be displayed on your screen.
Not sure of the english descriptions of these menus, I'll just tell you to enter the third menu item. (or press 3)
This is the test-menu for your cellphone. I certainly had much fun messing thru this menu, but for now try enter '1' for running a maindisplay-test. Your screen should cycle thru a colorful test, mainly displaying red, green and blue colors :)
second try the 2nd menu item, which test the lights/LEDs.
If this doesnt make your cellphone flash, on and off, with a 'Ok'-message, the LEDs may be out :/

Please reply if you tried this! :)