Two months after my update to Snow Leopard, my computer hung. When I restarted I could log in, but then the only thing I could do was moving the mouse cursor. So I called my support. The support told me to hold 6 keys on the keyboard during startup. This erased all my personal information but kept all my personal files. What is this program and how does it work? I have not been able to locate any information about it what so ever after a long search. My computer is a MacBookPro 4,1.
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I'm unaware of any six key startup modifiers. The closest is the four key ⌘ + ⌥ + P + R to reset NVRAM.
Apple documents Startup key combinations for Intel-based Macs.