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#31
I was pulling PC's open and rearranging their insides with a screw driver since I was 8 years old. Sometimes I didnt have a screwdriver, so used a butterknife just to get the screws loose, then undo them with my fingers.
Oh, the psu was still connected at both ends (mobo and wall).
Never had a problem doing that.
In fact, there is probably more chance of you getting electricuted by the static electricity in your jumper, thus it would be safter for your hardware that you do infact leave the psu plugged in and make sure you ground yourself to the chassis. Effectively diverting all static electricity through the chassis, through the psu, and down the earthing wire in the power cable. Infact, they have anti-static straps that are designed to do just this.
If your PSU is infact fried, then there is an insignificant chance that you will recieve any type of shock.
If your PSU is not fried, then there is a minute chance that you will recieve any type of shock.
With a PC of that age, and spec, I can assume the PSU is only around 120-150W?
Still, very little current to give you more shock than a 9v battery on the tounge would do.