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PC starts, but no POST

Discussion in 'Hardware' started by runiu, Jul 14, 2007.

  1. runiu

    runiu Nibble Poster

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    My PC behave crazy...
    Sometimes it turns on and it's working fine...
    But sometimes it doesn't...I mean...there is power...fans work...but no beep from speaker...and the screen is blank...

    Any ideas ???
     
    Certifications: A+, MCTS: Vista
    WIP: MCITP
  2. hbroomhall

    hbroomhall Petabyte Poster Gold Member

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    Intermittent faults are always difficult.

    When you get no boot or beep on switch on this *usualy* means that the processor isn't starting. The only way to check is by using a device known as a 'postcard'.

    It sounds like you may have a thermal problem. But whether this is the CPU, the motherboard, or memory is impossible to tell.

    Harry.
     
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  3. r.h.lee

    r.h.lee Gigabyte Poster

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    runiu,

    Try safely and carefully removing the RAM and see if you get the beep codes for "missing RAM."

    Please post back with your findings.
     
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  4. runiu

    runiu Nibble Poster

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    The thing is that it sometimes works...

    I checked memory and it's ok...cpu is also ok...it's not overheating...

    It just sometimes turns on and works fine and sometimes just turns on without any beep...crazy...

    When I took off RAM also there wasn't beep...
     
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  5. Paul_o

    Paul_o Nibble Poster

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    i had a similar thing when building my system. it would power up ok but would not post, turned out to be the graphics card. the fact yours has no display,might be worth trying a spare graphics card if you have one.
     
    Certifications: C&G Advanced diploma in network support
  6. hbroomhall

    hbroomhall Petabyte Poster Gold Member

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    Another possibility - depending on the age of the machine, is 'bad caps'. Look at the electrolytic caps on the motherboard. Are the tops flat, or are they bulging. See here for an article with some photos.

    While this was a a few years ago I'm still seeing such motherboards being brought in because of problems.

    Harry.
     
    Certifications: ECDL A+ Network+ i-Net+
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  7. r.h.lee

    r.h.lee Gigabyte Poster

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    runiu,

    Does your motherboard have an onboard or external speaker?
     
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  8. greenbrucelee
    Highly Decorated Member Award

    greenbrucelee Zettabyte Poster

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    Check your PSU is connected to the mobo properly
     
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  9. ThomasMc

    ThomasMc Gigabyte Poster

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    is it an asrock k7 board?
     
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  10. Sparky
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    Sparky Zettabyte Poster Moderator

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    Perhaps remove all the unnecessary hardware components you don’t need and boot from there. Do you have a graphics card on your mobo that isn’t being used? If so disable it.
     
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  11. Mathematix

    Mathematix Megabyte Poster

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    Have you reset the BIOS with everything in? I've had these exact ssame symptoms several times because my system didn't like Starforce (a copy protection system that installs software on your system that you otherwise wouldn't).

    Give that a go before pulling apart your system.
     
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  12. Spilly

    Spilly Kilobyte Poster

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    Had several doing this recently........

    Check all electrolytic capcitors for a brown discharge as well as dooming or splitting of the tops.

    Try using a torch to shine on them to see any damage!
     
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  13. runiu

    runiu Nibble Poster

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    I guess the best thing to do is never switch off the machine ;)

    I managed to switch on correctly and I won't switch it off ;)
     
    Certifications: A+, MCTS: Vista
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