TechSpot

Help my pc all of a sudden won't start

By shutup
Jun 19, 2006
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  1. OK I have a
    GA-K8NF-9 Gigabyte motherboard
    Athlon 64 3200 CPU
    1GB memory
    Antec 450watt PSU.

    Everything was going fine, I shut the pc down at night then the next day I go to turn it on and NOTHING. Naturally I thought it was the PSU, so I took it out and took it to the shop where I had purchased it. They hooked it up to a tester and said it was working fine. I seen the fan spinning and it looked good. So I'm thinking something must have been loose in my pc. I hook the PSU back up and same thing. Nothing happens, fan doesn't spin or anything. I've tried different cables, tried using the reset switch instead of the power thinking it may have been the switch, I even tried just using a jumper instead of connecting the power switch cables on the front of the box so in theory when I flip the switch on the PSU it should come on. Still nothing happens. The fan on the PSU doesn't even spin.

    Does anyone have any ideas??
  2. iss

    iss TechSpot Chancellor Posts: 2,896

    it sounds like you have a dead Mobo. is there a green light on the mobo showing when the PSU is plugged into the board?
  3. shutup

    shutup TS Rookie Topic Starter

    No unfortunately there aren't any informational LED's on the board
  4. nork

    nork TS Maniac Posts: 631

    Sometimes a power supply has to be re-set. Try this:

    Remove the main power cord from back of case to wall, make sure the power switch on the back of the power supply is in the on position.
    Now press and hold the main power-on button at the front of the case for at least one minute. Let it go after a minute and then switch the
    switch on back of power supply to "off" and reconnect the main power cord to the back of the case, turn the same switch at the back to "on" The computer may seem like its powering on and stop, that is normal and will stop. Now quickly press and let go of the front main power-on button as you normally do.

    Did you do anything to your pc at all before that, like a windows setting change, hardware change, driver change, anything at all?
    Did you move your pc at all?
    Do any fans spin at all?
  5. shutup

    shutup TS Rookie Topic Starter

    ok here is the update:

    I went and bought a new motherboard, hooked it up and everything. Nada, zip, nothing! SAME ****!
    Then I tried connecting an old 250 watt PSU with only the min. config. IT WORKED! :confused:

    So it looks like it was the PSU I'm not sure how it worked when it was tested. I'm gonna call the PSU company again tomorrow to see what they have to say. then I'll update...

    Thanks for everyone's help! :grinthumb
  6. nork

    nork TS Maniac Posts: 631

    I have a good idea what happened. You can take a power supply tester, of which i have 3, and hook a power supply up to it and it will run. But that doesnt mean anything. You have to test all the rails (different power lines, 12 volts, etc) that are on the ps. ONLY if all the rails are running in spec is the ps good. But some of these shops employ some people who dont know a lot more than you know, lol. So they connect the ps to the tester and the ps turns on, then they tell you the ps is ok. NOT true, of course.

    So that may very well have happened to you. I imagine the antec is faulty.
    I can give you some websites that show you how to test a ps properly. All you need is a multimeter and a tutorial. I can get you the tutorial free and the multimeter can be found in the U.S. for under $10 often.
  7. nork

    nork TS Maniac Posts: 631

    troubleshoot power supply with multimeter:
    http://techrepublic.com.com/5100-10...g=feed&subj=tr#

    You have to sign up and become a member but its a great site and they dont bug you or sell your name, ive been there for many years, great site.
    And they have a great tut for power supplies.

    Look at this:

    Most Common Pc Problems:

    26% PSU and power issues
    23% Bad gear and user negligence
    13% Heatsink related
    15% Assembly and moving
    10% Lightning strike and static
    3% Computer cruelty
    6% USB related
    2% Overclocking

    And finally, lists of good and bad power supplies by mfg.
    Here are lists of good and bad power supplies:


    http://club.cdfreaks.com/showthread.php?t=142753
    http://forum.pcmech.com/showthread.php?t=98650
    http://forum.pcmech.com/showthread.php?t=131195
    http://www.hardforum.com/showthread.php?t=792566
  8. shutup

    shutup TS Rookie Topic Starter

    cool thx for the info Nork :grinthumb
  9. nork

    nork TS Maniac Posts: 631

    No problem.
    Hey, people, the net, and forums help me out every day, i only try and give back a bit!
  10. Tedster

    Tedster Techspot old timer..... Posts: 10,074   +13

  11. Kirill2006

    Kirill2006 TS Rookie

    The same problem

    I've got the same problem one week ago. Computer was working fine. Next mornig could not strat it. Fans working, bit nothing else. I opened computr, there is a green led on montherboard. It is not a power supply for sure. I bought a new one but the result was the same. But, in fact, I got a voice message from computer when I am trying to start it. The message is:
    "System falis, CPU test".
    So, I beleive, it is CPU. Or, may be, motherboard. I brought it to a specialist and he did not find the rpoblem. So I bought a new CPU, motherboard and case. Now, the problem is: when I collected all parts and trying to turn on that "new" computer, it starts but doesn't see both CD/DVD drives. When I change "slave" to "master", it can see both CD drives but it cannot strat becasue it doesn't see harddrives. Still cannot resolve this problem.
     
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