Varying fan speeds on new build - dying PSU ??

Hi folks.

Just finished assembling a new-build, but using my existing case and PSU. The mobo doesn't get as far as POST (no beeps, no life), and despite everything having power, I can hear the CPU fan revving up to full speed, and then gearing down, up and down, seemingly at random.

Is this the symptom of a dying PSU, a bad build, or some other component failing ?

The setup is ...

akasa P400-FG PSU
asus M4A785TD-V Evo M/B
AMD X4 635 CPU
2 x 2 Gb Kingston DDR3 KVR1333D39K2 RAM

No need to mention the hard drives I guess, since they're not even connected yet.

Any ideas ?
9 answers Last reply
More about varying speeds build dying
  1. What you mean.."mobo doesn't get as far as POST (no beeps, no life), "
    Could be memory..
  2. try one RAM dimm at a time
  3. ortoklaz said:
    What you mean.."mobo doesn't get as far as POST (no beeps, no life), "
    Could be memory..


    Sorry, I'll try to be more specific.

    The motherboard powers up (there's a green LED indicator that shows it is powered), all the fans start, including the CPU fan. However, you can quickly hear the pitch (and therefore speed) of the CPU fan varying.

    I said there wasn't the distinctive beeps from the motherboard indicating errors, but in the last few hours I've been trying (without success) to find out for sure whether this particular board even has any kind of on-board speaker to beep with, and the case I'm using has no internal speaker, so maybe that's why I'm not hearing anything.

    Needless to say, no signal is getting to the monitor either.

    Hope that clarifies, and thanks for your advice, I'll try the DIMM's in turn.
  4. no your mobo doesn't have a built in speaker=no sound
    are you using onboard video or card?
    check your bios,connections,cables,fallow troubleshooting guide in manual
  5. swap speakers from old pc or buy new ,only like 3$
  6. my have to flash bios
  7. ortoklaz said:
    no your mobo doesn't have a built in speaker=no sound
    are you using onboard video or card?
    check your bios,connections,cables,fallow troubleshooting guide in manual



    Onboard video. If I had any expansion cards in there, I would have mentioned them in the OP.

    I've checked every cable and connection there is, my manual doesn't have a troubleshooting guide, and how the hell do I do anything with the BIOS if I can't see ? Like I said, there's no signal at all to the monitor.

    Besides, this Mobo came straight from the manafacturer, surely it wouldn't have the wrong BIOS installed.

    Meantime, I will wait another 5 days while someone from Ebay sells me a speaker.

    :<
  8. try different memory
  9. i had similar problem before,my memory module didn't seat correctly(make sure you hear "cklick" )
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