Hey and thanks in advance, My MBP has been acting unreliably recently, primarily by automatically rebooting, typically after opening up the screen. When I took my MBP to the Apple store, they ran the diagnostics and then, based on the issue I described, suggested reformatting the hard drive. When I took my laptop back to the Apple store, they used some third-party, non-Apple software called "Deploy Studio Runtime" that appeared to use a script and computationally intensive program to reset the hard drive. My laptop developed new issues, and I wound up taking my MBP to another Apple store location and they used the built in DiskUtility software and the Ethernet operating system to "re-image" the hard drive. Though this initially appeared to fix the problem of my laptop automatically rebooting, after about a week, my laptop begun automatically shutting down, and not rebooting. Further, my laptop often fails to even turn back on, and I have to try numerous times to start up my MBP. From my view, the erasing and resetting of a hard drive appears like the most intrusive process to subject a laptop to, and I am surprised the Apple endorsed DiskUtility was not the Apple store's go to method for reformatting the hard drive. What does hard drive reformatting exactly affect? Could this affect more than just the software components of the hard drive, and cause other types of unanticipated hardware/software compatibility issues? Any other thoughts? From the looks of my current MBP issues, I would say that the numerous hard drive resets have aggravated the initial problem I was trying to fix.