i have a p4 2ghz m/c. i used in for a year. then i decided to clean the m/c and remove all accumalated dust. i uninstalled all the parts and reassembled the m/c after cleaning it . now i get a shock when i touch the m/c , the mouse, system case. i checked the earthing wiring of my house from an electrician everything seems fine. why is this happening.how dangerous is this shock for the m/c . what can happen.

What is m/c??

You would not want to plug in the computer until it has been looked at carefully. Since you are getting a shock I would suggest bringing it into a computer shop and let them have a look.

m/c means machine.

It sounds like you set up a nasty short circuit while you were working on it. You may be able to find it, but you need to unplug the computer from the wall and I would push the power button after that to make sure you discharge the capacitors. Check for any evidence of a piece of metal touching the case somewhere that it shouldn't. If you can't find it, don't plug it back in, just take it in like Whyzman says....

Ok, the earthing in the house is good! But, Is the cable thru which you give power to your m/c(PSU) is a 3 pin cable?
How are you managing power to the Monitor? Is it connected separately or Is it connected to the m/c PSU.
Plzzz note that power given to both the Monitor and the Cabinet should be earthed!!!
Most of the time its the Monitor that causes this kind of shock.
Disconnect the Monitor (both the signal cable and power cable) from the m/c and see if you get any shock!

Plzzz pst back!

when i removed the the power cable for the monitor which was through the psu and the signal cable the system does not give a shock. thks
so i suppose i shud take the monitor to the service centre.why was this happening . what must be wrong with the monitor.
if the system even after disconnecting it from the monitor would have given a shock what might be the problem. why would it happen. im asking u this as im a novice user and i shud not be cheated by the pc technician.
what effect would this shock cause on the system or the mobo.
thxz

I don't know if I can answer your questions, but my guess is that the problem is your power supply rather than the monitor.

Also, monitor repair usually costs more than the monitor is worth...

Shock

Would this be a constant?

You said: when i removed the the power cable for the monitor which was through the psu and the signal cable the system does not give a shock. So what part were you touching to say it no longer had a 'charge'?

Static electricity charges dissipate and don't return unless you drag your feet on a rug or similar. That would be a spark. Usually one is paranoid of touching the wires again...

Line voltage shocks would be more of a constant ZAP! Touch it again, ZAPPED again..

Hang on to it, well sometimes it'll kill you.

But by the story said, Budfred, disconnecting the monitor stopped the shock. Just how the user managed to 'see' the differrence is where I'm still tryin to figure out,,, Was it a pulse, or a steady flow..

Here's a different theory :)

There's a current leak somewhere within the monitor. Most computer monitors have some sort of metal chassis inside onto which is normally grounded either through a regular 3-lead power cord (monitor - wall outlet) or through the PSU plug on the computer case.
If your computer's power cable isn't properly grounded (or if a grounding lead somewhere within the computer case got disconnected, say, BY CLEANING) then your computer case would become live if the chassis within the monitor became live too.

When you disconnected the offending monitor, your computer case stopped giving you shocks - go figure. You probably need to have your monitor repaired, but I'd check the grounding wire within the computer (or PSU) case. It's often connected to the case by a simple screw which can be accessed from outside of the PSU - you might have accidentally removed it while dismantling the computer...