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  • Favenviro
    PCHF Member
    • May 2024
    • 7

    #1

    Send Help

    I built my own PC for the first time in a months long slog of research, finally finishing it at the end of February. It lasted two and a half months before I heard a very loud pop while I was playing football manager last Wednesday, everything shut off, and I could smell smoke.

    Earlier that day, I had attempted to connect a second monitor to the PC. I’d had two monitors for quite some time, but only had one power cable, and the graphics card (MSI Geforce RTX) only had one HDMI port (which was used for my first monitor) and three Display Outputs, which I didn’t initially have the appropriate cables for.

    The power cable for my second monitor was delivered first, and it was the day I was fiddling with trying to attach it - and realising I couldn’t - that the PC went up in smoke, causing nothing to turn on.

    Opening up the PC and inspecting, I couldn’t find any visible damage. After some research, it appeared that the Power Supply (Corsair RM750e) was the most likely culprit, so on Thursday I bought a replacement (MAG 850GL). And sure enough, lights and fans all began working, and I was elated. What’s more, the Display Output cables had been delivered, I could hook both monitors up.

    But when I connected the two monitors, they recognised connection, but only displayed a ‘no video input’ popup. After more inspection and research, the EZ Debug Light on the Motherboard is bright red for the CPU (AMD Ryzen 5700).

    I’m worried it’s because I’ve been a bit too forceful with the fan (also AMD, the model specifically designed for my processor), which was surprisingly difficult to actually screw in. There were some times when the motherboard would not turn on and no lights would come on, even with the new power supply, and I was able to isolate the fan as the issue after I had screwed the fan in as tightly as possible, unscrewed it after I thought I’d turned the power switch off on the power supply, but in actuality hadn’t, and everything turned on while I was unscrewing it.

    I found two bent pins on the CPU and figured that would be causing the debug light, but I was able to straighten them, and the debug light would still turn on whenever the motherboard gets power, and I still get no input on the monitors.

    My RAM consist of two GSkill Ripjaws (16gb each).

    To be clear, all of the cables I have been using were in use before the power supply exploded and I never had any problems with them, and have not encountered any cable damage.

    When I first heard the pop, I was worried that the graphics card was the culprit, as I’d been fiddling with its sockets a few hours earlier, and I was worried something was still wrong with it after I couldn’t get displays, but its fans were running. I have no idea where to go from here.

    Am I missing anything??
  • veeg
    PCHF Director
    • Jul 2016
    • 8978

    #2
    Hello

    What is your gpu spec’s ?

    Comment

    • Favenviro
      PCHF Member
      • May 2024
      • 7

      #3
      Originally posted by veeg
      Hello

      What is your gpu spec’s ?
      Hey, it’s this one here sorry

      https://au.pcpartpicker.com/product/...0ventus2x12goc

      Comment

      • veeg
        PCHF Director
        • Jul 2016
        • 8978

        #4
        Either way the smoke is not a good sign.. So you did not find any popped caps and or any scorch marks ?

        @PeterOz

        Comment

        • Favenviro
          PCHF Member
          • May 2024
          • 7

          #5
          Originally posted by veeg
          Either way the smoke is not a good sign.. So you did not find any popped caps and or any scorch marks ?

          @PeterOz
          No I didn’t, but I think it was likely to be the power supply - I have tested both plugged into the motherboard back to back and the new one at least gets the lights on the motherboard and all the fans going, whereas the old one gives no response

          Comment

          • PeterOz
            PCHF Technical Response Team
            • Mar 2021
            • 4190

            #6
            AMD Ryzen 5700
            G or X or U which model?

            Comment

            • PeterOz
              PCHF Technical Response Team
              • Mar 2021
              • 4190

              #7
              Originally posted by Favenviro
              I was able to isolate the fan as the issue after I had screwed the fan in as tightly as possible
              Big mistake.
              When you took the fan off and checked the cpu pins did you reapply thermal paste?

              Comment

              • Favenviro
                PCHF Member
                • May 2024
                • 7

                #8
                Originally posted by PeterOz
                Big mistake.
                When you took the fan off and checked the cpu pins did you reapply thermal paste?
                I did not reapply thermal paste as I had none on hand. It felt impossible to screw them all in as screwing one corner of the fan in seemed to slightly displace the other sockets a little bit.

                CPU was a 5700X

                Comment

                • PeterOz
                  PCHF Technical Response Team
                  • Mar 2021
                  • 4190

                  #9
                  ok remove the fan and check the pins again incase you have rebent them.
                  When you install the fan you screw one side in about 2-3 turns only
                  then do the diagonally opposite 2-3 turns
                  then the one next to that one 2-3 turns
                  then do the diagonally opposite 2-3 turns
                  once all 4 screws have taken you can the go more than 2-3 but NOT all the way
                  Slowly work your way around.
                  You do not over tighten - just till it takes.
                  I would recommend you replace the thermal paste.

                  [MEDIA=youtube]WbvKjsuznBk[/MEDIA]

                  Apply Thermal Paste Click On Me to CPU Everyone has a different method.
                  The aim is a nice covering Too little = Bad, Too much = Bad (Think Goldilocks and the three bears). Pic attached
                  [ATTACH type=“full”]13748[/ATTACH]

                  Comment

                  • Favenviro
                    PCHF Member
                    • May 2024
                    • 7

                    #10
                    So purely a lack of thermal paste could cause enough of a problem to inhibit the cpu and cause video display to fail?

                    Comment

                    • PeterOz
                      PCHF Technical Response Team
                      • Mar 2021
                      • 4190

                      #11
                      Originally posted by Favenviro
                      So purely a lack of thermal paste could cause enough of a problem to inhibit the cpu and cause video display to fail?
                      No
                      Lack of proper thermal can cause rapid heat in the cpu.
                      Because you had trouble installing the fan I would check the cpu pins again and reinstall the fan as per my instructions or the video.

                      I always replace the thermal paste once it has had the bond broken But that’s just me.

                      Comment

                      • Favenviro
                        PCHF Member
                        • May 2024
                        • 7

                        #12
                        When the fan was on too tight, nothing responded, no lights on the motherboard, no fans. However when loosened all did work except for video display - including the CPU fan

                        Comment

                        • PeterOz
                          PCHF Technical Response Team
                          • Mar 2021
                          • 4190

                          #13
                          any error lights?
                          power down
                          Reseat GPU
                          connect via hdmi only
                          The power problem could have damaged your gpu

                          Comment

                          • Favenviro
                            PCHF Member
                            • May 2024
                            • 7

                            #14
                            The only error light is on the EZ Debug for the CPU

                            Comment

                            • PeterOz
                              PCHF Technical Response Team
                              • Mar 2021
                              • 4190

                              #15
                              Post # 11

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