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what is the purpose of reseting VRAM and PRAM?

Twe Foju

Twe Foju

macrumors 6502
Original poster
ok so many has suggest if like something is wrong with our hardware, we should do a Apple+Option+P+R Command to reset the PRAM and VRAM

so what is the purpose of it?

and is it safe to run the command for more than once?
 
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