No bios screen/video

**Brand new build is not showing any signs of boot to BIOS. Both external and internal build attempts seem to be failing.**

First time builder (experts commence chuckling to yourself now). After collecting all the parts over the last 2 months I finally sat down to do an extenal build before putting it together in the case.

MOBO: Gigabyte GA-990FX-UD3
CPU: AMD FX-4170
RAM: GSkill Ripjaw X 8Gb (2x4Gb) 1600
PSU: Seasonic X series X650
CASE: Antec 302

I was unable to get a BIOS screen (making me think GPU problem). I didn't have a speaker to plug into the mobo header so never heard a POST beep if there was a signal. (Antec case doesn't have internal speaker).

I've gone through the Troubleshooting steps (sticky post) short of pulling and resetting the CPU.

(I did pick up a mobo speaker last night.)

-Pulled GPU. No POST.
-0, 1 and 2 memory sticks. No POST.
-Installed in case with front panel power switch and LEDs installed. No POST and the PWR LED lit up for maybe a second or two before going dark.
-Have not got any beeps error or otherwise from the speaker.

In all cases the CPU fan and GPU fans (when installed) came on.

-I ensured grounding myself throughout the build.
-There are no mobo standoffs, screws or wires etc shorting the mobo.
-Both Motherboard power and CPU supplemental are plugged in.
-GPU was seated and had power.
-Pulled the mobo battery to reset CMOS.
-I dont have access to extra build parts to swap and test except an old GPU, but this doesn't look to me like its a GPU problem.

The only possible problem I know I could have induced was while mounting the stock cooler, I set it on the CPU 90degrees off and had to pick it up and turn it to lock it down and some of the paste was already stuck on the CPU. Could it be as simple as the thermal paste not having good contact after turning? This is my next step when I can get out to buy some new thermal paste.

Any other noob steps I'm missing?

10 answers Last reply Best Answer
More about bios screen video
  1. Doubt that you lost enough thermal paste to make a difference. Might as well reseat the CPU just to see if that solves the problem.

    Sorry to ask the simple...Is the 8 pin CPU power cable connected?
  2. Yes. 24pin mobo plug and 8pin supplemental CPU plugged in.
  3. Do you have the front panel speaker cable connected to listen for a beep code?

    Scratch that. Appears that case doesn't have speaker cables
  4. I did get a speaker to plug in, but there are no tones at all coming from it.
  5. Looks like you have done everything correctly and it's narrowed down to the MB or memory. What's the model number of your G.Skill?
  6. G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-8GBXL

    Though i've tried to get at least an error POST with no memory installed, so I've mostly ruled out memory.
  7. Best answer
    Looks like that narrows it down to the MB
  8. Yep. Put the multimeter on the psu and all the voltages were good. Pulled the CPU and no bent pins, correct orientation in the socket...

    Mobo is in the box awaiting an RMA

  9. Best answer selected by cpokey26.
  10. Thanks! Good luck and let us know if the MB is the culprit.
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