New desktop computer won't POST

Discussion in 'Computing and Networks' started by DerStrom8, Jan 26, 2013.

  1. DerStrom8

    Thread Starter Well-Known Member

    Feb 20, 2011
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    Hello again, everyone!

    This question actually goes to all you computer techies out there:

    Some of you may remember that I was thinking about purchasing a desktop computer from a friend of mine. Well, it happened--last night I bought it and put it together today. Now the problem is this: When I turn on the computer, the fan turns on, as do all the lights, but the computer just doesn't POST. My monitor just stays blank. I've tried both the VGA and HDMI outputs, on both video cards, and neither one works. Any thoughts to why a computer wouldn't boot? I've tested the PSU and made sure all the outputs were good (I heard that's one of the main reasons it wouldn't work), so I was wondering what else might have happened? Also, when I start it up, I hear a beep and everything but there's no signal to the monitor. Not sure if it just won't boot, or if it might be a problem with the video output....?

    Thanks for any suggestions, guys!
    Best wishes,
    Matt
     
  2. nerdegutta

    Moderator

    Dec 15, 2009
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    When I put together a computer with used parts, I hardreset the BIOS. There should be a jumper to do that.

    Is the RAM inserted properly?

    Graphic card inserted properly?

    Is it only one beep? Usually there is a meaning with the beep. To help trouble shoot.

    Have you tested the monitor on your laptop?

    How aboutthe user manual for the motherboard?
     
  3. DerStrom8

    Thread Starter Well-Known Member

    Feb 20, 2011
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    Hey nerdgutta.

    The RAM was the first thing that came to mind. I'll be doing some testing tomorrow to see if it's any good. Make sure it's seated properly, etc.

    Only one beep at startup, which is the error code for a problem with the memory refresh circuitry, which would probably mean a problem with the RAM.

    The monitor is my TV, which has VGA and HDMI inputs. I've used it before, so I'm sure it works.

    The manual is probably buried in the box of goodies that came with the computer. I'll check it out tomorrow.

    Thanks for the help!
    Regards,
    Matt
     
  4. nerdegutta

    Moderator

    Dec 15, 2009
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    What is the name/brand/number of the motherboard?
     
  5. debjit625

    Well-Known Member

    Apr 17, 2010
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    Remember their are Graphic Modes for your VGA driver ,if they are not supported nothing will be displayed on your monitor.

    To check POST we use POST card (Power On Self Test card)
    http://en.wikipedia.org/wiki/Power-on_self-test

    If you can, use it or try some other monitor...

    Check out the motherboard's manufacturers website,to get details about the video drivers

    Good Luck
     
  6. atferrari

    AAC Fanatic!

    Jan 6, 2004
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    Yes, one means that it is OK.
     
  7. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    If it has been without power for too long it probably dropped the bios. It's a common problem with buying secondhand PCs that have not been plugged in for weeks.
     
  8. atferrari

    AAC Fanatic!

    Jan 6, 2004
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    Could you explain that Roman?
     
  9. DerStrom8

    Thread Starter Well-Known Member

    Feb 20, 2011
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    Thanks for the responses guys!

    Something important that I forgot to mention was that the person who sold it to me hooked up another power supply before he sold it to me and it worked. I'm getting the feeling that even though the output voltages from the PSU are right, that they are not very clean. I'm going to have to hook up a scope to it to check it out. If the problem is, in fact, the power supply, I'd like to try to repair it myself. What might cause the output to be unclean?

    Sorry for forgetting to mention that.
    Best wishes,
    Matt

    P.S. According to This Site, 1 beep on startup means there's a problem with the memory circuitry....? I'll check the manual and see if I can give you any other specs.
     
  10. atferrari

    AAC Fanatic!

    Jan 6, 2004
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    Mine, once it beeps once, (could take some 3 sec since switch on), starts the booting.
     
  11. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    Without the motherboard power the BIOS battery can go flat.
     
  12. BReeves

    Member

    Nov 24, 2012
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    What vintage main board? Older boards needed a neg 5 volts from the power supply and newer supplies do not have it.
     
  13. DerStrom8

    Thread Starter Well-Known Member

    Feb 20, 2011
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    Oops, guess I forgot to update you guys.

    The other day something occurred to me. Now, the graphics cards that came with this thing have three video outputs--VGA, HDMI, and DVI. I didn't have a monitor with a DVI input, so I tried my VGA monitor and my HDMI TV. Neither worked. After going through all that trouble, it struck me. I contacted the original owner and asked him what output he used. Sure enough, it was DVI. Apparently he had it defaulted to DVI, so VGA and HDMI wouldn't work. I borrowed a monitor with a DVI input, and BINGO! Everything worked like a charm.

    So I knew it was something stupid and simple, yet so obscure.

    Anyway, thanks everyone for your suggestions!

    Best wishes,
    Matt
     
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