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Hardware Thread, New PC not working in Technical; Ive just bought myself some new components for a new machine have put it all together and its not working. ...
  1. #1
    DSapseid's Avatar
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    New PC not working

    Ive just bought myself some new components for a new machine have put it all together and its not working.

    Symptoms
    When the power button is pressed on the front of the case the psu fan, cpu fan and graphics card fan all come on at a reduced speed. I reset the cmos just as something to try and now it 'pulses' on and off.

    Things already done
    Reseated RAM, Proccessor, Graphics Card.
    unplugged all hdds and dvd drives
    tested psu with voltmeter and voltages are fine.

    Parts
    Gigabyte GA-P55a-UD3 LGA1156 motherboard
    Intel i7 760 socket LGA1156 CPU
    ATI Saphire Radeon HD5770 1gb PCIE Graphics Card
    8gb DDR3 Kingston RAM
    2 x Hitachi Deskstar 1tb SATA HDD
    Antec 300 Case
    Antec 650W PSU
    Sony DVD ROM
    LiteOn DVDRW

    Im thinking dead motherboard? What do you reckon?

  2. #2

    glennda's Avatar
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    check that the mobo isn't shorting against against the case

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    DSapseid's Avatar
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    what try removing the motherboard from the case? and see if it works?

    Sorry not with it today!! No sleep and here at 6.30 this morning!!

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    Check the polarity of the connectors and they are on the right pins.

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    glennda's Avatar
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    Quote Originally Posted by DSapseid View Post
    what try removing the motherboard from the case? and see if it works?

    Sorry not with it today!! No sleep and here at 6.30 this morning!!
    well normally when you put mobo to the case you have some little (sometimes brass) standoffs which you put in between the case and mobo

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    DSapseid's Avatar
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    Quote Originally Posted by laserblazer View Post
    Check the polarity of the connectors and they are on the right pins.
    Im guessing you mean the power/reset buttons etc. Ive just pulled them all off except the power button and made sure the black was on the negative one.

    Quote Originally Posted by glennda View Post
    well normally when you put mobo to the case you have some little (sometimes brass) standoffs which you put in between the case and mobo
    Sorry yes i had them in.

    Still pulsing where the fans are on for about 7-8 seconds then off for 3 seconds.

  7. #7
    DSapseid's Avatar
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    Ive just taken everything out and started again from scratch and found an onboard speaker in my box of stuff to try and diagnose further.

    When i press the on button now it is on for 3 seconds then off for 3 seconds then on for about 12 then repeats. When it is in the 12 second stage it beeps madly!! like as if a key on a keyboard was stuck in. There is no keyboard plugged in though.

    Only things attached, are CPU, RAM, 2 PSU cables, Power Button connector and speaker.

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    If the graphics card has been removed then it will give strange beeps. Does the graphics card require a power cable of some sorts ?
    maybe check the ram in another PC ? And to rule out a dodgy power switch remove it and short the 2 pins with a screwdriver.

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    DSapseid's Avatar
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    Well im thoroughly confused!! Its now working!! I just kept moving the ram sticks thorough different sockets and its now working!!!

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    Do you mean i5-760?
    If so, I would test a couple of different power supplies. Some supplies have a limitation on simultaneous +3.3V and +5V current, others need a minimum draw on all rails to work. Running the mobo outside of the box is also a good idea.
    Also go over any jumpers on the mobo in case some have fallen out.
    Try a different - lower power - graphics card.
    Try a different - older - CPU if possible - in case yours is defective or in case the BIOS version on the mobo isn't aware of the particular i5-760 version you have. The mobo could have been sitting on a shelf since it was released in the beginning of last year with a corresponding old BIOS version, while the CPU could be fresh from the factory.

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    chazzy2501's Avatar
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    did you plug the cpu fan into the cpu fan header?

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    ccp
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    Glad to hear you got it working, I would check your RAM in another case if you can as you may have a faulty stick.
    Also check the RAM Rails to ensure none of the pins have come away from the rail itself.

    One other thing to check is to make sure everything that requires power - has power. Some mobos need seperate power which is generally supplied by the main ATX like connector.

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    Quote Originally Posted by DSapseid View Post
    Well im thoroughly confused!! Its now working!! I just kept moving the ram sticks thorough different sockets and its now working!!!
    i had this on a AM3 board a while ago, would boot and then stop or complain about fan headers, turned out it was an iffy mainboard.
    id run a memtest on it and do some stress testing as well.

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    Intel boards like RAM in certain configurations these days, think triple channel, a bit of RTFM and you can find out how it likes its RAM sticks.

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