PC build doesn't power on

  1. Hi guys, I've spent today building a pc for myself. However, on pressing the on button there's no reaction at all. My machine specs are:

    M/B - Gigabyte GA-970A-UD3
    Processor - AMD 8270
    RAM - Corsair 8Gb DDR3
    Case - Zalman Z11
    Graphics card - Gigabyte HD7870
    PSU - Corsair CX750M (750W)
    Wi-fi card also installed, but can't remember the name and seem to have temporarily lost the box in a pile of packaging

    So far I've checked the CPU and motherboard power sockets, the wall plug sockets and the power cord to my PSU. I've also checked the connections between my case and the motherboard, and these all appear to be correct.

    As part of this final point, I switched the power on LED with the power button (they both originate from the same location so thought they may be mixed up). Anyhows, I got a solid LED, which suggests to me that a) there's power running through the switch circuit and b) the pc isn't booting when told to, as a solid LED would indicate circuit completion,which would be the equivalent of holding in the 'on' button.

    If anybody could shed any light on where to go next, I'd be eternally grateful (currently searching the house for a paperclip to test the PSU...).
  2. cliffordcooley

    cliffordcooley TS Guardian Fighter Posts: 8,378   +2,766

    Does the CPU and case fans move at all, when pressing the power button?
  3. Stephen Bowles

    Stephen Bowles TS Member Topic Starter

    Hi Clifford,

    There's no reaction whatsoever. I've checked and double-checked all the connections and just can't seem to find anything wrong.
  4. Stephen Bowles

    Stephen Bowles TS Member Topic Starter

    A quick update - I've tested the PSU by 'jumping' it and it works fine, as do the attached peripherals. I've checked the mounting of the motherboard too and can't seem to find any sources of shorting or suchlike.
  5. cliffordcooley

    cliffordcooley TS Guardian Fighter Posts: 8,378   +2,766

    Is there a way you can post pictures of all your power connection? Specifically your front panel pin row header.
  6. Stephen Bowles

    Stephen Bowles TS Member Topic Starter

    Is this what you're looking for? Sorry it's not too clear, but had to cut it right down to get it uploaded.

    Attached Files:

  7. GhostRyder

    GhostRyder TS Evangelist Posts: 2,187   +587

    Did you plug in the 4/8pin connector at the top left of the motherboard?
  8. Stephen Bowles

    Stephen Bowles TS Member Topic Starter

    In the wee hours of this morning, I finally managed to get the build working.This followed removing all components and finally the motherboard from the case, and testing just the board and CPU. So, I'm guessing it was a short circuit, but I still can't see where. My best guess is this - there are two countersunk screws on the underside of the board that jut out a bit. The screws holding the motherboard in the case were extremely tight, so I'm thinking that maybe the screws were tightened enough for there to be contact between the case and countersunk screws.

    So far, I've replaced the board, not tightening the screws up so much, testing along the way. This morning I'll be adding all the connections and then PCI cards. Fingers crossed it's problem solved.

    Thanks for the help guys.
  9. GhostRyder

    GhostRyder TS Evangelist Posts: 2,187   +587

    Cool Good luck!

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