Desktop died, which component failed?

I am having a problem with my desktop. I have tested it as much as I believe I can and would appreciate your opinions.

One day it shutdown by itself while I was Alt-Tabbing between a game (EU:IV) and my browser (Google Chrome). Since then it won't turn on. Then fans won't even turn on when I press the on button. The only thing that I can see is a green light on the motherboard, which is on all of the time when the PSU is plugged in. Also two days before the PC died the screen went blank. I fixed it by taking the graphics card out and putting it back in.

I have tried the following things to troubleshoot it:
  • I took the CPU out an placed it back in, but it didn't help. I replaced the thermal paste at the same to make sure that there is a good contact and because the old paste was drying out, especially in the centre.
  • I removed everything from the case to make sure that nothing was shorting, but that didn't help.
  • I tried unplugging everything that wasn't essential, leaving only the CPU, GPU, PSU, Motherboard and a single stick of RAM in the case. This indicates that the peripherals (disk drives, hard drives and SSD) aren't the problem.
  • I replaced the GPU with an older one and tried the other PCI-E slot, so it's not that.
  • I used different sticks of RAM in different slots, so that's not the problem.
  • I shorted the power connectors on the motherboard which connect to the switch, but that didn't work so the switch isn't the problem.
  • I took the PSU out and connected the green wire in the 24-pin connector to one of the black wires. This turned the PSU on, showing that it works under no load.
  • I also tested the PC with another PSU with no luck so that that's not the problem.
  • I reset the CMOS by moving the jumper on the motherboard to the adjacent pins, waiting for 30s and setting it back to how it was.
  • I checked the motherboard for any blown capacitors, but didn't find any.


From this testing the only two components that haven't been fully tested are the CPU and motherboard, with the motherboard being the most likely one. If it was the CPU I would expect the fans to turn on at least.

If you agree with me and think that it is the motherboard then I think that I will by a replacement one. I'd say that eBay or AliExpress are my best bets as LGA 1155 motherboards don't seem to be manufactured anymore.
Reply to Arzhur
7 answers Last reply
More about desktop died component failed
  1. I think you've covered everything. Only suggestion would be a complete removal of the motherboard from that chassis and a thorough visual inspection to see if there is a visible point of failure.

    Few LGA1155 boards are available new, so getting a used one is your best bet. You might try the Tom's classifieds first though, or reddit.com/r/hardwareswap.
    Reply to Eximo
  2. Something tells me it's the GFX card. There is no proof to support my suspicion. Alt plus tabbing will of course affect the GFX card's load. The black screening is another indicator.

    Do you have a 20+4 pin motherboard power connector? Try only the 20 pin part.

    Ivy er no, Sandy has been around for a loooong time.

    Wait one. You asked about your PC but didn't bring it here. It must feel so neglected. is what I have in my Vivo Titan case along with an EVGA 500W+ PSU. Why is that important? Age.

    Since Sandy has been around for years it's possible your GFX card has failed.

    I do however appreciate the extensive troubleshooting that you did do. Some want us to be Sherlock Holmes with only a few symptoms and zero troubleshooting.
    Reply to aquielisunari
  3. Eximo said:
    I think you've covered everything. Only suggestion would be a complete removal of the motherboard from that chassis and a thorough visual inspection to see if there is a visible point of failure.

    Few LGA1155 boards are available new, so getting a used one is your best bet. You might try the Tom's classifieds first though, or reddit.com/r/hardwareswap.


    Thanks for the suggestion. I already inspected the board when I removed it for testing and and checking the caps. All that I could see was that a few of the solders were a bit brown. I assumed that this was just some soldering flux.

    I'll have a look at the links that you gave.
    Reply to Arzhur
  4. aquielisunari said:
    Something tells me it's the GFX card. There is no proof to support my suspicion. Alt plus tabbing will of course affect the GFX card's load. The black screening is another indicator.

    Do you have a 20+4 pin motherboard power connector? Try only the 20 pin part.

    Ivy er no, Sandy has been around for a loooong time.

    Wait one. You asked about your PC but didn't bring it here. It must feel so neglected. is what I have in my Vivo Titan case along with an EVGA 500W+ PSU. Why is that important? Age.

    Since Sandy has been around for years it's possible your GFX card has failed.

    I do however appreciate the extensive troubleshooting that you did do. Some want us to be Sherlock Holmes with only a few symptoms and zero troubleshooting.


    Thanks for the points. While the graphics card does seem suspect I ruled it out by testing with a very old one that should be working (a nVIDIA GeForce 8400). I also tried turning the PC on without any card plugged in and it still didn't turn on.

    Unfortunately my PSU only has a 24 pin connector, not a 4+20 one, so I can't test the 20 pin part separately.

    Sorry about not posting the specs of my PC. I had them saved in my profile, but didn't notice that they weren't displayed. I have added them to my signature. I doubt that I can display them as you did as I can't turn the computer on to use the program that you did.
    Reply to Arzhur
  5. Arzhur said:
    aquielisunari said:
    Something tells me it's the GFX card. There is no proof to support my suspicion. Alt plus tabbing will of course affect the GFX card's load. The black screening is another indicator.

    Do you have a 20+4 pin motherboard power connector? Try only the 20 pin part.

    Ivy er no, Sandy has been around for a loooong time.

    Wait one. You asked about your PC but didn't bring it here. It must feel so neglected. is what I have in my Vivo Titan case along with an EVGA 500W+ PSU. Why is that important? Age.

    Since Sandy has been around for years it's possible your GFX card has failed.

    I do however appreciate the extensive troubleshooting that you did do. Some want us to be Sherlock Holmes with only a few symptoms and zero troubleshooting.


    Thanks for the points. While the graphics card does seem suspect I ruled it out by testing with a very old one that should be working (a nVIDIA GeForce 8400). I also tried turning the PC on without any card plugged in and it still didn't turn on.

    Unfortunately my PSU only has a 24 pin connector, not a 4+20 one, so I can't test the 20 pin part separately.

    Sorry about not posting the specs of my PC. I had them saved in my profile, but didn't notice that they weren't displayed. I have added them to my signature. I doubt that I can display them as you did as I can't turn the computer on to use the program that you did.


    Okay.

    The embedded picture is a result of an integrated feature here at the forums. When you are replying you can look above the text box and see a pic/Polaroid icon. Click on that and paste a direct picture link that ends with a bmp, png, jpg or other pic based url like https^postimg*org/t4ajhopvb/Far_Cry4_2016_11_08_22_14_29_543.jpg. Click the icon, paste your url and click on enter. I modified it with a ^ and a * so Tom's wouldn't truncate it.

    How that works on a phone or other device I am not certain.
    Reply to aquielisunari
  6. aquielisunari said:
    Arzhur said:
    aquielisunari said:
    Something tells me it's the GFX card. There is no proof to support my suspicion. Alt plus tabbing will of course affect the GFX card's load. The black screening is another indicator.

    Do you have a 20+4 pin motherboard power connector? Try only the 20 pin part.

    Ivy er no, Sandy has been around for a loooong time.

    Wait one. You asked about your PC but didn't bring it here. It must feel so neglected. is what I have in my Vivo Titan case along with an EVGA 500W+ PSU. Why is that important? Age.

    Since Sandy has been around for years it's possible your GFX card has failed.

    I do however appreciate the extensive troubleshooting that you did do. Some want us to be Sherlock Holmes with only a few symptoms and zero troubleshooting.


    Thanks for the points. While the graphics card does seem suspect I ruled it out by testing with a very old one that should be working (a nVIDIA GeForce 8400). I also tried turning the PC on without any card plugged in and it still didn't turn on.

    Unfortunately my PSU only has a 24 pin connector, not a 4+20 one, so I can't test the 20 pin part separately.

    Sorry about not posting the specs of my PC. I had them saved in my profile, but didn't notice that they weren't displayed. I have added them to my signature. I doubt that I can display them as you did as I can't turn the computer on to use the program that you did.


    Okay.

    The embedded picture is a result of an integrated feature here at the forums. When you are replying you can look above the text box and see a pic/Polaroid icon. Click on that and paste a direct picture link that ends with a bmp, png, jpg or other pic based url like https^postimg*org/t4ajhopvb/Far_Cry4_2016_11_08_22_14_29_543.jpg. Click the icon, paste your url and click on enter. I modified it with a ^ and a * so Tom's wouldn't truncate it.

    How that works on a phone or other device I am not certain.


    Thanks for the reply. However, my problem isn't how to upload the image, it's that I can't make it because I can't turn the desktop on. I could run speccy on my laptop but that wouldn't be of any help as its working perfectly.

    As I can't give the specs with speccy her they are:
    • Operating System: Windows 7 Ultimate 64-bit
    • CPU: Intel Core i5 2500k @ 3.3 GHz
    • RAM: 8.00 GB Dual Channel DDR3 @ 1600MHz (9-9-9-24)
    • Motherboard: Asus p8p67
    • Graphics: Samsung px2370 (1920x1080@60GHz), 2048MB AMD 6950 (Asus)
    • Memory: 931GB Samsung, ~119GB Samsung 830 (SSD)
    • Optical: Toshiba DVD drive (can't remember the model), LG BH10LS38.AUAR (blu-ray drive)
    • Audio: Realtek High Definition Audio
    Reply to Arzhur
  7. I have managed to get my system to boot. I ordered a new motherboard (an Asus P8Z77-V LX) to replace my old one and now it works.
    Reply to Arzhur
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