Boot failure.. CPU or GPU?

By XnaX ยท 9 replies
Aug 1, 2011
Post New Reply
  1. Hi,

    I've just bought some new components for my system.. I'm new to the whole custom building, so I read all the manuals and followed them strictly, point to point.. When I then pushed the start button, everything but the fan on the GPU started and just stood there.. No POST, no nothing.. My mobo claims it's the cpu failing though.. Any ideas on what's actually failing?

    My setup:


    ASUS Crosshair V Formula
    AMD Phenom II X6 1100T Black
    2x4GB Kingston HyperX


    Nvidia GeForce 280GTX
    A 750W PSU of a maker i can't recall (it's bottom mounted, so it doesn't show)
    Samsung 500GB HDD

    Any help would be greatly appreciated
  2. Route44

    Route44 TechSpot Ambassador Posts: 11,984   +72

    First, very nice new hardware components.

    Second, though it can happen the cpu is one of the most stable if not the most stable hardware components in a system. How does the motherboard tell you, how is it worded, that the cpu is at fault?

    Two things: 1) Is the motherboard touching the case in any way? 2) Find the make of your power supply. I am suspicious of it.
  3. Modena

    Modena TS Booster Posts: 143

    I'd check to make sure you didn't miss any of the MB standoffs, you could also try re-seating the CPU. What was you're previous CPU/MB? I'd personally start with removing the GPU and trying to boot from the on-board video to see if you get a post at the very least, since you're GPU's fan isn't running.
  4. XnaX

    XnaX TS Rookie Topic Starter Posts: 39

    When i reseat my CPU, is it necessary to reapply thermal paste or is the current layer sufficient? (I'm quite a noob, so I'm not certain as to why thermal paste needs reapplying)
  5. Route44

    Route44 TechSpot Ambassador Posts: 11,984   +72

    Clean off the old paste using Q-Tips and rubbing alcohol at no less than 80%. Then get yourself some Arctic Silver and - I'm not making this up - apply no more than rice kernel size amount in the center. It will spread out when you attach the heatsink. Too much thermal paste and does the opposite of what you need it to do.
  6. Modena

    Modena TS Booster Posts: 143

    Remember to also be gentle when removing the heat-sink, you don't wanna bend/damage any of the CPU pins when removing the heat-sink. I say this because I personally remember having a little bit of trouble removing the stock AMD heat-sink when I upgraded to an aftermarket cooler. It will feel as if it's super glued down to the CPU. What I did was run Prime95 for about 30mins to loosen up the paste before removal.

    Did you ever end up trying to remove the GPU and seeing if it would post through the on-board video?
  7. XnaX

    XnaX TS Rookie Topic Starter Posts: 39

    No, I wanted to get my facts straight before starting, so I could try more than one solution :)
  8. Leeky

    Leeky TS Evangelist Posts: 3,797   +117

    Please also confirm you have connected the following:

    1. The 24 pin motherboard connector
    2. The 4/8 pin ATX connector
    3. The two 8 pin GPU connectors to your GPU
    4. That the CPU fan connector is connected to the correct CPU fan header.

    More often than not, one of these is missed by pure accident. Its nice to cover the simple stuff first :)
  9. XnaX

    XnaX TS Rookie Topic Starter Posts: 39

    Ok, I now tried reseating the CPU, I tried removing the GPU and I'm positive that the motherboard is installed correctly and that the power connectors and the CPU fan are plugged in correctly.. Still getting the same result; the CPU_LED on the motherboard is lit and the system doesn't POST

    There are different ways to connect the 4/8-pin connector though.. You can connect it as one 4-pin connector, two 4-pin connectors or one 8-pin connector.. Could it have anything to do with it, that I've used the 8-pin solution?

    Theres an LED on the motherboard named CPU_LED and it supposedly tells the user if the CPU is faulty or not

    My Previous MB and CPU was an ASUS P5QL Pro and an Intel Core 2 Duo E8500
  10. kristain

    kristain TS Rookie Posts: 47


    During the time when you are first booting your computer, make sure that the BIOS settings are set taking the primary boot sector to be the hard drive. This is done once you have successfully loaded the operating system. Improper installation of operating system and BIOS settings may also cause boot failure.

Similar Topics

Add your comment to this article

You need to be a member to leave a comment. Join thousands of tech enthusiasts and participate.
TechSpot Account You may also...