Which lightroom version are you using and what is the OS version?
And after runing adobe cleaner tool you are still able to see lightroom in your application folder and able to open it ?
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If the problem shuts down the computer, then you either have a hardware problem somewhere, or a bad/corrupted/out-of-date video driver. If possible, re-install your video driver making sure you have the latest version. Otherwise, it could be a bad fan causing the CPU to overheat, or bad motherboard or bad memory or just about any other component in your computer. I don't care that Apple said the computer was fine, if it's not the video driver then you have a hardware problem somewhere.
Thanks for your response. Think I know what the problem is now.
Yeh true, I reckon it's the logic board. Apple replaced it just over 3 months ago with a "new" one. Thanks!