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by hvs 6197 days ago
For the power supply, you can usually just follow the manual for installation. I just replaced (last night, actually) my 700W power supply with a 1600W one and I think it took 30 minutes, including time to unplug everything and take off the case. The cables are all pretty self-explanatory and can only be plugged in one way to one port. The only way you would ever be electrocuted is if you worked on it while it was still plugged in. If you do that, you probably deserve whatever you get.