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I recently swapped my PSU into another system, and even if I don't have it plugged into the power outlet i get shocked touching the case, and and this even happens with the psu unplugged from the wall and nothing plugged into it inside the system, what could be the problem?

The problem is that the PSU capacitors hasn't been drained even when its unplugged. You should have pressed the power-on button to fully discharge the capacitors. More info here...
http://en.wikipedia.org/wiki/Comput...
i_Xp/VistaUser

Well i noticed I still had the monitor plugged into the surge protector and into the system (even the times I had the PSU unplugged), after trying a different outlet I don't seem to have the prob anymore, still though if it pops up again any possible causes/answers please?

Impatient, aren't you? You can't bump in these forums.
You might get an answer if you explain more clearly.

Ah, sorry to seem impatient just concerned/looking for an answer, basically, anytime I touch a metal part of the case i get shocked, its not static (its persistent) no wires are cut/frayed, the board is seated properly on the standoffs and it even does it whenn the system psu has no cord connected and nothing hooked into it (mobo, drives, etc, nothing connected) but it only happens when mounted inside the case..

Likely then the current leakage is from the monitor. The monitor cable shield is connected to the case. If current coming through the cable isn't going where it's supposed to then when you touch the case you're providing the path to ground. Could be a problem with the monitor, monitor cable or even the video card, as they're all in the circuit. It could also be a grounding problem with the monitor power. You might want to get one of these:
http://www.homedepot.com/webapp/wcs...
Radio shack and electrical/electronic supply houses should carry them too. Then test the power strip sockets as well as its wall socket.
If nothing definite turns up just replace the power strip and power cables to the monitor and PC.

This is a longshot, but could it be that the screws you used to mount the PSU into the case are too long & they're making contact with something inside the PSU?

+1 on the ground fault indicator tool. I was going to suggest a grounding problem - as electric shocks should NOT happen, if all attached devices are grounded properly.
In other words.... Make sure you're plugging your devices into a 3-pronged outlet. And NEVER, NEVER cut off that 3rd prong!!! That 3rd prong essentially attaches to your computer's case and is the path of least resistance. In a shock scenario, with a properly-grounded system, the electricity should go through that ground and blow your home's breaker, before going through you.

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