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I purchased this Toshiba Satellite A500 about a week and a bit ago and this mark has appeared on the screen.

enter image description here

Is it dead/stuck pixels or is it cracked within? I haven't done anything to crack the screen so how could something like this appear?

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up vote 4 down vote accepted

That looks more like a crack rather than dead pixels.

If you run your finger over it, can you feel any bump? (May want to put a thin cloth there first so you don't leave any marks).

Anyway, no matter what, if you only bought it a week ago, they should have no problem in swapping it for a new one under warranty as if you did nothing to cause it*, it must be a manufacturing problem.

*e.g. no equal marks / dents on the lid in the same place.

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Yep, that's physical damage and not dead pixels. Ask for a replacement. – Torben Gundtofte-Bruun Nov 25 '09 at 12:09

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