checked power supply ok when i plug it in nothing goes on except the small green motherboard led unplug from board and fan starts to spin replug in board fan stops press power button same thing pc won't start tried shorting start button still nothing i'm thinking motherboard is shot i'm using a 20pin atx power supply 350 w
Switched system on. Loud spark sound and smoke came from near power supply. Replaced power supply, absolutely no response from mother board. Fan does not come on, power supply does not start. Removed PB sw from header on mother board and closed switch circuit, nothing happened. Disconnected PS and took pin 14 (green line) to ground, Power supply kicked in. Look like mother board is dead. Are there any on board SMT fuses that can be checked? Mikeyfoxtrot@yahoo.com
Do you have a LAN connection on the machine that you use? That would be an area to start to make sure that (when a LAN cable is plugged in, the incoming and outgoing lights will blink) the power supply still works. If the power supply does still work, it could be the motherboard or CPU which isn't working. It could be something simple like thermal compound needs to be reaplied to the CPU, or there may be faulty hardware. Let me know if the power supply is still working.
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If you can smell anything burnt in there it's toasted.
Comment by rifth, posted on Mar 14, 2008
I have had the same problem and I don't remember how I fixed it now. Basically my computer was dead, if I unhooked the plug from the motherboard and replugged it the light would flash green and fan would spin. My computers working fine now. It's something really stupid OH okay there were two power plugs coming out of my power supply one 16 pin or whatever and one 4 pin and I had them both plugged into the motherboard.
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electrolytic filter caps on the mother board have failed, and shorted. A dead short will sound like a gun firing inside the cabinet. A gradual short will make the can expand and split or work its way off the innards of the component
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1- try to clear comos in the motherboard pcb behind the battery
2- take off your pcb from your case and put it on any thing metal and try again to open it
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I was looking for a solution to my problem and ran across your post.
I have the same problem.
Here's what I found to get it working: I put the RESET jumper on the PWR on/off posts.
Some reason the RESET button will turn my unit on, but the POWER button will not.
Another finding when hooked up "normal"... if I remove the power cable and plugit back in the PC boots up. The POWER button will turn the unit OFF... but will still not turn the PC ON.
So for now I am using my RESET button as my power switch. What I'm trying to find out now is "WHY?"
-Hope this helps!
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