I need help I am completely confused.

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nickster5588

Commendable
Mar 13, 2016
6
0
1,510
I was using my desktop PC the other day and I knocked my table and my PC shut up and I smelt burning so looked into it for ages found out it was coming from a micro chip on the motherboard so I got a new motherboard from Asus, then i have to get another CPU from Intel then I got another PSU from corsair then I changed hard drives then I changed ram then I changer GPU and took GPU out and then I literally have nothing left to do. I have Asus h81m-plus motherboard / Intel pentium G3258 / 10gb Kingston RAM / corsair cx600 PSU / Asus nvidia gtx 750 ti / Seagate 1tb HDD. If you need more info tell me but no whenever I try turning on my computer the GPU and PSU and CPU fan all spin for 1 second then stop again, green led lights up on motherboard and on GPU, I cannot figure out what to do anymore, the little micro chip that has smoke from it was labeled PO121 on the motherboard, I have cannot think what to do anymore I need help.
 
Solution
Ralston18
Thanks. There are 6 of the "PQ's" as near as I can tell.

I found a Compaq Technical document that seemed to indicate that those points were video/graphics related. I know you have ASUS but just did note find anything more specific with respect to ASUS and the "PQ's".

The 4 pin CPU connector (2 yellow wires, 2 black wires?) that smokes provides +12v on each black (ground), yellow (+12v) if I am following everything correctly.

Smoking is because too much current is flowing somewhere most likely due to an electrical short somewhere or a failure making the expected voltage higher exiting the PSU.

To be up front I think trying to troubleshoot and repair your system is probably best done by a local PC business in your area.

Especially...
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Ralston18

Ralston18

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Oct 11, 2014
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Any signs of overheating at start-up? Could be causing an immediate shutown. Any beeps or error codes on the screen?

However you need to go back and re-assess your troubleshooting and actions.

First what is the problem? You need to know more about "PO121" - power ("PO") related maybe. Verify it is not P0121 (zero not "oh").

Look at the motherboard's user manual or otherwise go online and identify the microchip in question.

This link maybe:

https://www.asus.com/us/Motherboards/H81MPLUS/HelpDesk/

I found quite a few images, diagrams etc. for the Asus h81m-plus motherboard but did not note one that showed the PO121 microchip.

See if there is a schematic diagram that shows that connection/component.

Overall you have made many changes and that does cause confusion.

Take all apart again.

The fall may have twisted or otherwise deformed the case. May be causing an electrical short somewhere. Inspect the case carefully especially around connection points for components and the motherboard stand-offs.

Inspect via magnifying glass all components from the fall. Look for cracks, loose electrical components, burn marks, crushing, and so forth. Damage.

If you have family or friends with testing equipment maybe you could borrow the testers or have that person help you test.

Start with each component and, one-by-one, see if you can prove that that component is totally functional. Keep notes, mark each item as good, bad, or maybe. Remember plugging/connecting in something functional into something non-functional could damage or destroy the functional component.

Reassemble step by step using known working components. Keep the system as simple as possilbe. How is the 10GB RAM configured - seems a strange amount 4GB x 2 plus 2GB x...? Work with just 8 GB total (4GB x 2) to start with.

Double check all assemblies, cables, and connections.

Work methodically and carefully, keep notes, and write down the connetions made.

With some care and good luck you may be able to end up with a working computer again.

No other way to do it.....


 
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nickster5588

Commendable
Mar 13, 2016
6
0
1,510
I do understand what you mean about doing all this but I just don't have the equipment or knowhow to do this stuff, I have 8gb + 2gb ram sticks, tried taking one at a time and tried new ram sticks out the packet.. No idea other than what you said about broken stuff breaking the new stuff.http://s23.postimg.org/as7ujyfp7/Pics_Art_03_13_04_00_13.jpg /http://s27.postimg.org/qx1fixag3/Pics_Art_03_13_04_01_26.jpg these are where PQ121 are located. I didn't read correctly are print is very small but its called PQ121

Edit: I also forgot to add that when I unplugged the 4 pin CPU power cord the smoke didn't come out of there and it attempted to start (no video output at all) but when I plug in the 4 pin connector smoke comes out
 
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Ralston18

Ralston18

Titan
Moderator
Oct 11, 2014
34,908
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Thanks. There are 6 of the "PQ's" as near as I can tell.

I found a Compaq Technical document that seemed to indicate that those points were video/graphics related. I know you have ASUS but just did note find anything more specific with respect to ASUS and the "PQ's".

The 4 pin CPU connector (2 yellow wires, 2 black wires?) that smokes provides +12v on each black (ground), yellow (+12v) if I am following everything correctly.

Smoking is because too much current is flowing somewhere most likely due to an electrical short somewhere or a failure making the expected voltage higher exiting the PSU.

To be up front I think trying to troubleshoot and repair your system is probably best done by a local PC business in your area.

Especially if you do not have the knowhow and equipment to do so. Far greater chance that more harm could occur or even some dangerous situation would be set up causing you injury, more computer damage, or even a fire.

Then you would be out even more money or worse.

Hands on, professional exam & repair is needed.

 
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Solution
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nickster5588

Commendable
Mar 13, 2016
6
0
1,510
Yes I understand thanks you for helping with all the information and suggestions, I will go to my local PC store near me they also have a repair centre which is good, I reckon the things it could be are PSU or CPU.. AGAIN.. which is a pain if so but don't know what else to do, my younger brother has PC that works, only got 350watt vibox PSU but I could try it to see if it works and that'll answer the question I guess, I'm only 18 myself and don't have much knowledge or more importantly experience with troubleshooting hardware issues, I can deal with quite a bit but sometimes I guess I should just get help straight away if I don't know for sure. Thanks for helping though I'll also reply back once PC repair centre look at it. If they look at it more like and see what they say.
 
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nickster5588

Commendable
Mar 13, 2016
6
0
1,510
Okay so thought I would come back to finish this post. I rang amazon and their customer service is top notch they always help and sent a new CPU and motherboard next day, I took GPU and PSU back to PC world where I bought them to replace, now I slowly built my PC adding one little thing at a time and I tested the hard drives inna old PC to make sure they worked before putting them into new build, then they were fine so put them back then once I've loaded every thing back into my PC it is finally functional which I'm glad about, thanks for any help.
 
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