Mac won't start up

My mac has recently been shutting down with a weird screen, when I restart it there seems to be pixel damage and when i close it the apple light does not turn off.

aguild,
since you bought your 15-inch MacBook Pro in 2011, depending upon when in 2011 you bought it, your MacBook Pro could be a Mid 2010 model, an Early 2011 model, or a Late 2011 model. Some 15-inch Mid 2010 models are known to have a defect in their NVIDIA GPUs. Apple had a gratis servicing program for them that lasted for three years from the date of purchase; they still offer the servicing, but it is no longer guaranteed to be gratis. There are a couple of large discussions here about suspected similar problems in both of the 15-inch 2011 models, but Apple has not acknowledged the presence of a similar defect in those models, and thus does not offer a gratis servicing program for them. In any case, you might want to make an appointment at your nearest Apple store to have them run their Video System Test on your MacBook Pro, to see if your problem is hardware-related rather than software-related.

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    Message was edited by: noondaywitch

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