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Power Supply Made Weird Noise

Last response: in Systems
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December 16, 2009 4:58:35 PM

So I have had an older Athlon 64 X2 system running for years now using the same power supply. My roommate unplugged the computer moving stuff around. When I plugged it back in a really super high pitch noise came from the power supply and nothing would power on. Although the motherboard power indicator light was green. I tried another power supply that wasn't the right kind, it was an old 20pin vs. the newer 24pin that my mobo requires, and the fans would spin up at least. This made me convinced, along with the high pitch sound that my power supply had blown. So I ordered a new Enermax and plugged it in. Now EVERYTHING lights up and spins as soon as I flip the power supply switch on. So all the fans spin up and the case lights go on, but I get no motherboard post or any other beeps or boops. So obviously something is going. What do you all think it is? The mobo light is on and green. Hitting the power and restart buttons on the case don't do anything. Is the mobo fried? Could the case be faulty now? It worked perfectly up to this point. I have spare RAM sticks, another CPU, and Video Card to swap in, but I am thinking doing this will accomplish nothing if my mobo won't post. Anyway here is the whole tapout of the system as it is now.

Athlon 64 X2 3600
Asus A8N-E 939 Nforce4 Ultra
2gb of Corsair RAM
Super LanBoy Case
Enermax 720w Infiniti
Galaxy Nvidia 8800GT
300gb Maxtor HDD 16mb buffer 7200RPM
Creative Audigy 2ZS Platinum

Thanks for any help or suggestions. Right now my current thought is I am just gonna have to bite the bullet and get a new CPU, MOBO, RAM combo.
a b B Homebuilt system
December 16, 2009 6:10:43 PM

is the eps power plugged in?
a b B Homebuilt system
December 16, 2009 6:13:27 PM

There's another guy two threads over that's having a similar problem. I'll give you the same advice: Replace the CMOS battery on the motherboard before you go buying any new expensive components.

It sounds like your power supply did bite the dust, and replacing it was the right move, but being completely without power led to a separate issue.

With old systems, a lot of the time the CMOS battery will go dead, but the machine is fine until you unplug it from the wall. Then it "forgets" its BIOS settings and won't recognize the video card. So when you turn it back on, everything works but there's no display.

So I'd say first remove the video card, then follow the steps for a CMOS clear, and at the end, put a fresh battery in. Then reseat the card and power on. If you get video, great. If not, turn it off, remove the card, power back on with the card removed, power off and reseat the card, then turn on again. Basically, this is because a lot of systems will recognize the card fine after a BIOS reset, but some are picky and first need to be on with no card in order to know to look for a "new" card next time.
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December 16, 2009 7:59:15 PM

The EPS is plugged in. I tried erasing the CMOS as well. I wonder if it would be the battery as I replaced the board less than a year ago... Might be worth a try. Where would one get a CMOS battery?
a b B Homebuilt system
December 16, 2009 8:19:50 PM

I think they're pretty common batteries -- just LR- style flat batteries you can find at Radio Shack. Less than a year is a pretty short time for one of those to wear out, though. Wouldn't hurt to try replacing it, but don't be surprised if it's something else.

Next thing I'd do is test the video card in another system if possible (or trying the other card in your existing system). When power supplies blow, they can take other things with them, and since it sounds like you're getting no video, that's a good place to start.
December 16, 2009 8:42:47 PM

yeah I am going to throw my extra RAM, CPU and video card in to see if it makes any difference, but the way that everything starts running as soon as the power supply switch is flipped, without pressing the power button, makes me think it is a blown mobo first and foremost and then whatever it is past that will come up on it's own later.
December 17, 2009 6:49:58 PM

Tried replacing it all and it is all a no go. Looks like new system time...
a b B Homebuilt system
December 17, 2009 7:28:35 PM

biggreenmat said:
Tried replacing it all and it is all a no go. Looks like new system time...


Well, it definitely sounds like a fried motherboard is a possibility. When you said you replaced everything, did you mean you also tried plugging your other components into a different motherboard? It would be a shame if they all still worked and got thrown out if all you needed was a motherboard.
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