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Did I fry my Motherboard?

By 412t1
Apr 21, 2006
  1. I did something stupid and need your help! My P4 computer won't turn on.
    Here's what happened. I had taken out the cd burner to use in another
    computer and was putting it back in this one. When everything was
    hooked up, I plugged in the power cord and reached around the back to
    turn on the power switch. I hit the 230/115 switch by accident and
    moved that over to 230. I thought I had moved it back but I didn't
    check. I pushed the rocker switch on the PSU to the on position and
    went downstairs. I never powered up the computer. I went downstairs and
    shortly after heard a noise and went upstairs to see what happened. The
    power supply was smoking so I unplugged the power cord from the
    computer. I fried the PSU (I didn't know why until later)but thought
    the computer should be ok since I never turned it on. I got a new PSU
    and tested it so I know it's good but the computer does nothing when I
    push the on button in front. Did I fry the motherboard too? What are
    the chances other components are damaged?

    Thanks for your help!
     
  2. kirock

    kirock TS Rookie Posts: 1,221

    The chances of damaging your mobo is low IF you did NOT power on the PC when the PSU decided to die. I would check and dbl check your connections to the mobo, make sure you have the 4pin molex plugged in next to the CPU.

    Do any fans come on? Does the PSU fan come on? Any Beeps?
     
  3. Tedster

    Tedster Techspot old timer..... Posts: 6,000   +15

    I think you'll be ok. Just get a new PSU. If you're lucky the fuses did their job.
     
  4. howard_hopkinso

    howard_hopkinso TS Rookie Posts: 24,177   +19

    Hello and welcome to Techspot.

    I`m afraid to say, but yes you`ve probably fried at least your mobo and possibly you cpu as well, not to mention ram/video card etc.

    It`s probably a good idea to take your cpu and have it tested at your local pc repair shop. This should only cost a few bucks.

    If you`re lucky, your cpu will be ok.

    Regards Howard :wave: :wave:
     
  5. Peddant

    Peddant TS Rookie Posts: 1,446

    I suppose you could try disconnecting the burner,if you wanted to clutch at straws.:(
     
  6. kirock

    kirock TS Rookie Posts: 1,221

    I have to admit I'm a little confused why it smoked at all when it wasn't actually powered on. Actually I'm even more confused why he went downstairs twice but only came upstairs once and he was back at his PC.
     
  7. 412t1

    412t1 TS Rookie Topic Starter

    I took apart the power supply that went bad and there is a big black spot on the top of the case and solder spatters on the bottom so I guess it did a little more than smoke but yes the computer was never turned on after I hooked everything back up.
     
  8. CrossFire851

    CrossFire851 TS Rookie Posts: 766

    Was it pluged in? It's good to leave it pluged in, but make sure the little switch is in the off postion on the psu, just to be 100% safe. If it was on that's the problem.



    Try a different PSU and see if that works.
     
  9. kirock

    kirock TS Rookie Posts: 1,221

    The 230/115 switch just changes the number of windings on the primary winding of the main transformer. The only thing I can think of is that this effected the VSB (stand by voltage) sent to the mobo and this damaged the VSB mobo circuit. Now the mobo can't tell the new PSU to turn on.
     
  10. 412t1

    412t1 TS Rookie Topic Starter

    I checked the power button on the front of the computer and it has continuity when pressed and I do have voltage in one of the legs on the motherboard where the switch wires connect so it's looking like the problem is deeper in the motherboard meaning it's a good bet it's toast.
     
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