No display or mouse/keyboard functionality

By OCSS_Andrew
Dec 3, 2012
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  1. I recently rebuilt my computer with refurbished parts from another pc that I had laying around, which so happenly have parts that were upgrades for me.

    Brought my computer to work so I can run updates and use the ridiculous bandwidth to reinstall all my games and such. I download Guild Wars 2 and it runs just perfectly on the best settings. I go to check up on customer computers at the same time, as I walk back to my back office, I see my computer quickly shut down. I was a little surprised but it wouldn't let me at all turn the computer on unless I waited for it to cool down. 5 minutes later it lets me boot up, and it runs just fine with no problems. I investigated what could have caused the sudden boot-down, I reran guild wars 2 and let it sit around while I was watching the temps.

    The computer was running at around 60-61 Degrees C. Naturally I turned the computer off and unmounted the CPU so I can apply a good layer of thermal paste to reduce some of the heating. I remount the heatsink/ fan and go to turn it on but now the computer isn't displaying anything and the razor keyboard and mouse don't light up/ respond at all. I replaced the PSU with a brand new one from my shop just to see if it might have been it because I knew it was starting to smell wicked. I really cant figure out what I could have done between applying the thermal paste and reassembling it that could cause the USB bus's to not work and the display in both my Gcard and Integrated Graphics.

    Oh, and yeah I already tried using a different monitor, 3 different ones around the computer shop actually.
  2. mailpup

    mailpup TS Special Forces Posts: 8,279   +181

    Is this PC the same one you described in your other thread?
  3. OCSS_Andrew

    OCSS_Andrew TechSpot Member Topic Starter Posts: 24

    Yes it is, I have already performed a breadboard of the system and narrowed it down to 2 things, the CPU and the Motherboard. I think that the motherboard got shorted when I reinstalled the CPU and Heatsink. I must have not seated the cpu & heatsink to the board properly.

    Also im not getting a post beep when I have 1 memory chip, video card and processor hooked up during the breadboard.
  4. Tmagic650

    Tmagic650 TS Ambassador Posts: 20,457   +135

    Pull all memory and power on. You should hear constant beeping. If you hear nothing, I would go after the motherboard before suspecting the CPU
  5. OCSS_Andrew

    OCSS_Andrew TechSpot Member Topic Starter Posts: 24

    Yeah, I actually had done that before and was given a beep code (One short, one long) I tried it just now and it ended up being silent. Heavily considering it to be the motherboard.
  6. Tmagic650

    Tmagic650 TS Ambassador Posts: 20,457   +135

    When you re-installed the CPU and heatsink did you apply just a very small amount of thermal compound to the CPU, after cleaning of the old paste?
  7. OCSS_Andrew

    OCSS_Andrew TechSpot Member Topic Starter Posts: 24

    Not a very small amount, a good layer all around to all four corners and over the surface area of the cpu. altho I did put alittle too much because the thermal dribbled off the sides.
  8. Tmagic650

    Tmagic650 TS Ambassador Posts: 20,457   +135

    Sounds like way too much. Too much thermal compound can act like and insulator, keeping the CPU hotter than necessary
  9. OCSS_Andrew

    OCSS_Andrew TechSpot Member Topic Starter Posts: 24

    Ah ha, well ill remember that from now on. Hopefully after the holiday season ill have my pc back up and running. Thanks for your help Tmagic650
  10. Tmagic650

    Tmagic650 TS Ambassador Posts: 20,457   +135

    Yes just a tiny pea sized amount right in the middle of the CPU die... The pressure of the installed heat-sink will spread the paste out thinly and evenly over the whole die surface, and not over-lapping the dies edges at all
  11. OCSS_Andrew

    OCSS_Andrew TechSpot Member Topic Starter Posts: 24

    Could a re-flow of the board give me a temporary fix until I can purchase a new one?
  12. Tmagic650

    Tmagic650 TS Ambassador Posts: 20,457   +135

    You could try...


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