Hello Linda, I have experienced a problem similar to this myself. The system shutting off suggests to me that the problem is hardware related and internal otherwise (usually) only the app would close. I think the problem maybe that the computer being used for Photoshop is overheating due to the excessive load on the system. Usually when a computer is overheating it will impair its capabilities and therefore not allow you to open photoshop. I would recommend opening up the computer checking for any obstructions to the airflow of the computer (e.g. cables, dust, loose components), typically dust build-up will be the main cause of overheating. Whilst the computer is opened up you may as well take the opportunity to reapply thermal paste to the processor. Hope this helps.
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