Help! PC turning on but no display and shocking when I touch the chassis.

[bifinhogod]

So, 3 months ago I've bought a new PC. But the PSU they sent was incompatible so I had to use an old one that I had. So far so good, until I started noticing shocks whenever I touched the chassis. Then one day I turned on the PC and there was no display. No mouse, keyboard and monitor signal.

 

I've switched the power cable and it fixed this for a week, but the same symptoms appeared again, so I sent the PC to a technician. He tested it, and it worked, so he told me the problem was my house's wiring. I live on a rent and the wiring here sucks, and has no earth wires. He told me to either move out or to get a UPS.

 

So I bought one and everything worked for 3 weeks, until this week the same problem appeared again. I've switched the power cables again, and it worked again for 4 days, but today it happened again, and switching cables is not working.

 

Does anyone have an idea of what it could be? Maybe it is the PSU? Would it cause the computer chassis to shock and the PC to power on but giving no display? What could explain the fact that sometimes the PC works fine and all of a sudden he stops displaying (detail: this only happens when I turn off the PC at night and then try to turn it on the next day)? I've already spent too much money buying the UPS.

 

Thanks for reading.

[bifinhogod]

I need the PC for my work so I really need help thanks

[191x7]

Do not run a UPS on a socket without grounding, it becomes a safety and fire hazard.

And a UPS won't solve having electricity on the chassis. Grounding would do that.

[SpookyCitrus]

Sounds like you need to move somewhere with proper electrical. Not much you can do if the outlets in your home aren't properly grounded besides fix it, depending on where you live that is something the landlord is responsible for, and it can also break laws and city code not having grounding or proper electrical. Also curious on what make and model PSU you have in it?

[bifinhogod]

4 hours ago, SpookyCitrus said:

Sounds like you need to move somewhere with proper electrical. Not much you can do if the outlets in your home aren't properly grounded besides fix it, depending on where you live that is something the landlord is responsible for, and it can also break laws and city code not having grounding or proper electrical. Also curious on what make and model PSU you have in it?

Yes she is responsible, but here in Brazil she can delay the repair for months. Tho if this is the only way then that's what I'll do.

 

Would improper grounding alone cause the problems I'm facing?

 

My PSU is a 500W EVGA model 100-W1-0500-KR.

[bifinhogod]

5 hours ago, 191x7 said:

Do not run a UPS on a socket without grounding, it becomes a safety and fire hazard.

And a UPS won't solve having electricity on the chassis. Grounding would do that.

So the only solution would be to get a proper wiring on the house?

[191x7]

1 hour ago, bifinhogod said:

So the only solution would be to get a proper wiring on the house?

 

Are these the type of outlets you use?

 

Do you have a multimeter or a voltage meter? Can you check if there's voltage on the grounding pin in the socket?

Can you measure the voltage on your case?

 

The grounding should take the excess voltage from the case through the PSU into the house wiring and then into the ground.

 

But even with no grounding, the PC chassis should not have voltage on it. It means something is providing voltage to the mass (on the case) and the ground wiring isn't grounding. 

 

I've seen faulty power strips cause some voltage on the grounding pins in it, and I've seen cheap outlets having some voltage on the grounding pin although the grounding has been done right (?!) but also faulty components releasing some voltage onto the case.