Pc power up problem

Discussion in 'PC hardware help' started by alienator, Apr 9, 2008.

  1. alienator

    alienator Regular member

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    Long time since i last posted,lol, but......

    My current problem is that my computer suddenly wont turn on. I decided to open it up, and to see if eveything was fine. Powered it on, while the case was on... the fan moved for a second, and the mini light at the front of the case came on, but this then stopped (after a sec) and nothing else happened.]

    As a precautionary, to see if any problems were up with any of the 2 RAM modules, i tried the computer with 1 each. But the problem remained entirely the same as above.


    I fear this may be a PSU problem, but im not a 100% sure! Just needing some refined guidance on this problem thanks.
    if it is can you help me with the best under £20 choice here?
    http://www.microdirect.co.uk/productlister.aspx?&n=2,10,75&s=5&cpp=100

    If the problem is a motherboard problem, could anyone please recomend a motherboard from here:
    http://microdirect.co.uk/productlister.aspx?n=2,16,3355,973&n=921
    between £55-£75

    Thanks,
    Hope this problem works out!
     
  2. sammorris

    sammorris Senior member

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    NEVER spend that little on a Power supply, or you'll have far worse problems than your PC not turning on, cheap PSUs damage parts, and can even catch fire. I recommend that you AT LEAST go with this unit:
    http://www.scan.co.uk/Products/ProductInfo.asp?WebProductID=644038

    The problem may well be your PSU, but given your case it could also be an overheat trigger, so you may want to check your CPU heatsink and replace as ecessary (note, you will need to clean and replace the thermal paste on the CPU and remove the existing paste from the heatsink if you remove it unless you have already applied your own)
     
  3. alienator

    alienator Regular member

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    Thanks sam, ill be getting a new psu today. I just really hope the problem isnt the motherboard

    just as extra info, my current psu WAS running on a 315W psu.
    It came as standard with the packard bell pc that i bought.

    As for the thermal paste, i haven't ever changed that yet in the 2-3 years of my pc

    In case this helps: my current specs:
    2.93ghz processor socket 775
    315W psu
    2x512mb ram - ddr pc3200
    one lightscribe dvd writer

    its not too good, but i do hope to upgrade in the near future
     
  4. alienator

    alienator Regular member

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  5. sammorris

    sammorris Senior member

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    Packard Bell PSUs can sometimes be a bit crap if I'm honest. I'm sticking with the PSU at the moment based on my previous experience with those units.
     
  6. alienator

    alienator Regular member

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    Last edited: Apr 10, 2008
  7. sammorris

    sammorris Senior member

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    Last edited: Apr 10, 2008
  8. alienator

    alienator Regular member

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    Currently, ill try give as much detail as possible

    Socket 775 pentium 4, 2.93GHz processor, stock fan
    Ram: 2x512mb DDR pc3200
    Hard drive: master drive is sata (160gb), Secondary drive is IDE(80gb)
    Optical Drive: LiteON IDE drive
    Graphics card: not sure if just pci or pci-e, but its a ATI radeon X300, only VGA output
    Video tuner card with single input
    Thats all i can think about

    But, if i got a mobo id want it to be a DDR2, and dual core supportable. I dont mind buying new ddr2 ram.
    Yeh arias kewl, whats good is that aria and microdirect and aria are both in close physical proximity to me
    so i dont mind either way
     
  9. sammorris

    sammorris Senior member

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  10. alienator

    alienator Regular member

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    Hey, ive bought the parts and ive never ever done anything like change a motherbaord, but im really proud of myself! I did it sucessfully and ive got everything reconnected except the processor

    i didnt want to take a risk, so i ask...when ive placed the CPU in the socket, should i clear the thermal paste on it from before and also the heat sink, and put some more and then re-connect or should i just reconnect with the same thermal paste

    thanks man,


    ps...on that mobo is the inbuilt graphics better than the one on my x300?
     
  11. sammorris

    sammorris Senior member

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    When moving a processor, if you're using the heatsink that came with it, you will need to remove the thermal paste on the heatsink and the CPU and apply new stuff (to the CPU only).
    As for the graphics, theyre probably very similar.
     
  12. alienator

    alienator Regular member

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    okay, well thats the only thing preventing me right now from booting up and testing my pc, but it looks quite nice now lol :)

    as for the graphics, guess ill have to try them out and see :)
    but im not much of a gamer to be honest, i use my laptop more for that!

    but thanks soo much sam, youve helped me alot!
     
  13. sammorris

    sammorris Senior member

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    laptop? gaming? herecy! lol
     
  14. alienator

    alienator Regular member

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    lol


    but the problem still hasnt sorted out, and now when i connect my keyboard the keyboard lights flash, and when i press the on button it doesnt even turn and no lights come on :-(

    ive replaced the mobo and psu
    any suggestions what could be wrong, i think there may be a short cicruit some where but im not sure where...
    any extra help?
     
  15. sammorris

    sammorris Senior member

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    Are you sure you've hooked up the power switch correctly to your new motherboard?
     
  16. alienator

    alienator Regular member

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    everything fitted in really well, so id presume so

    i plugged in the 24pin wire and ATX 12V wire in


    id presume the power wires were correct since the keyboard lights came on when i switched the psu supply button on
     
  17. lourrific

    lourrific Guest

    I had the same problem with the exact same symptoms you described and I was able to solve it by removing an external USB hub I had connected wich apparently stopped functioning properly and was causing boot up problems...in short check your USB devices.
     
  18. sammorris

    sammorris Senior member

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    Lol no there's more to it than that!
    Your case switch and power LED/Hard disk Led are connected to the motherboard at the bottom... I take it you haven't connected them...
     
  19. alienator

    alienator Regular member

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    erm.. ive not got any usb deviced plugged in


    my mobo usbs should be perfect since i just bought a new mobo


    also ive tried this with nothing but the cpu, the ram, and the psu
    to no avail
     
  20. sammorris

    sammorris Senior member

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