Computer started smelling and touch with screw gave sparks

[dtodorovic40]

Well i putted new fans into my pc,and when i tried to start it,i smell something like burned or new plastic and computer booted up perfectly fine,i touched the case with screew for case and it gave sparkls so i instantly turned it off.What it could be?!
I smelled all components and nothing smells like plastic and im scared of that spark

 

[mdd1963]

WHat exactly does "I touched the case with screw for case and it gave sparks"...mean?

Tocuhing the outside of the case, you see sparks? I'd say your case is a floating ground, and your PSU is being fed by a 2 prong receptacle. or, a 3 prong with no ground....

If your fan relies on a chassis ground, and it is not present..who knows...

Or perhaps you connected a 3 prong fan to a 4 prong header, and got something reversed, electrifying the outside of your chassis? (which has no return, running on a 2 prong AC input?)

 

[dtodorovic40]

mdd1963,you know those toolfree plastic screws.Well i touched the outside of the case with it,and it sparkled,it gave a bit electricity beetwen them.All the fans are connected with molex except 2 of them witch are 3 pin connectors that i didnt even touch.I had to unscrew some cable touching the case with screw,but i turned it back so i dont think that is the problem.Should i be worried?

 

[dtodorovic40]

WHat exactly does "I touched the case with screw for case and it gave sparks"...mean?

Tocuhing the outside of the case, you see sparks? I'd say your case is a floating ground, and your PSU is being fed by a 2 prong receptacle. or, a 3 prong with no ground....

If your fan relies on a chassis ground, and it is not present..who knows...

Or perhaps you connected a 3 prong fan to a 4 prong header, and got something reversed, electrifying the outside of your chassis? (which has no return, running on a 2 prong AC input?)

Also computer booted normally and it didnt show any signs of damage.Graphic card didnt smell,neither did mobo or cpu heatsink

 

[mdd1963]

Are you saying a fan wire was trapped underneath or case lid or screw and was damaged?

If your case is hot, that is a problem....; get/borrow voltmeter, set alternately to VDC (polarity wont matter), one side in ground (lower center) prong of 115V AC 3 prong outlet, the other lead touching bare metal of lid or case (need bare metal or screw, not thru black paint...)

Is your PSU run off a valid 3 prong input, where the PSU (and indirectly the MB and case) have an actual ground?

 

[dtodorovic40]

Are you saying a fan wire was trapped underneath or case lid or screw and was damaged?

If your case is hot, that is a problem....; get/borrow voltmeter, set alternately to VDC (polarity wont matter), one side in ground (lower center) prong of 115V AC 3 prong outlet, the other lead touching bare metal of lid or case (need bare metal or screw, not thru black paint...)

Is your PSU run off a valid 3 prong input, where the PSU (and indirectly the MB and case) have an actual ground?

No my PC case is not hot,neither were any components.Im not sure but i have one ground cable that screwed in on the top of the case.My PSU is ran from a valid 3 prong input.I dont know if my motherboard has ground somewhere nor do i know how to check that

 

[norcalsc]

Try a different wall outlet

 

[dtodorovic40]

Try a different wall outlet

It was always on that same one,but ill try it out

 

[mdd1963]

sparking on the case means it is hot...

Perhaps you have a mainboard mounting stud where it should not be, or a pinched wire trapped in between the lids, or fan wire chaffing. trapped where it should not be, including brishing up against a turning fan...

Is your AC input to PSU a 2 pin prong or 3?

 

[dtodorovic40]

sparking on the case means it is hot...

Perhaps you have a mainboard mounting stud where it should not be, or a pinched wire trapped in between the lids, or fan wire chaffing. trapped where it should not be, including brishing up against a turning fan...

Is your AC input to PSU a 2 pin prong or 3?

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