Does anyone know about a white screen upon start up?

My daughter has an older MacBook and we have upgraded software. She tells me that she has a white screen upon start up each time she turns on (boots up) the laptop. I tried to boot the machine up to see what IOS version she has but can't get past the white screen. I trried moving the mouse and pressing arbitrary buttons to no avail.

Try booting from an installer DVD. If that works OK, then reinstall OS X.

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