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Pop noise and smell

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  • Power Supplies
  • Components
Last response: in Components
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December 19, 2011 12:58:53 PM

System:
Asus p7h55-m pro
Intel g6950
Radeon hd 6870
4gb ddr3
7200rpm 2tb Seagate

Hey guys I'm new to this forums and have a question about this machine thy happened to me last night it is driving me nuts! I bought an antec case and a silver star certified 650w psu. I switched all the components over to the new case and pushed the power button. I heard a pop then a burning smell. The computer didn't shut off it just won't show any display. It powers up and everything fans gpu CPU hard drive everything has power and running but nothing is being displayed. I tried using my old psu and nothing changed. I true reseating the gpu and ram. Still nothing. The smell is gone now and I can't distinctly tell where it came from originally because it was gone fast. No signs or traces of burn on the mobo either. Any ideas or help would be greatly appreciated

More about : pop noise smell

a c 144 ) Power supply
December 19, 2011 1:04:58 PM

:hello:  Welcome.

If you moved everything to a new case, you may have a misplaced standoff.

The following is an expansion of my troubleshooting tips in the breadboarding link in the "Cannot boot" thread.

I have tested the following beep patterns on Gigabyte, eVGA, and ECS motherboards. Other BIOS' may be different, but they all use a single short beep for a successful POST.

Breadboard - that will help isolate any kind of case problem you might have.
http://www.tomshardware.com/forum/262730-31-breadboardi...

Breadboard with just motherboard, CPU & HSF, case speaker, and PSU.

Make sure you plug the CPU power cable in. The system will not boot without it.

I always breadboard a new build. It takes only a few minutes, and you know you are putting good parts in the case once you are finished.

You can turn on the PC by momentarily shorting the two pins that the case power switch goes to. You should hear a series of long, single beeps indicating memory problems. Silence indicates a problem with (in most likely order) the PSU, motherboard, or CPU. Remember, at this time, you do not have a graphics card installed so the load on your PSU will be reduced.

If no beeps:

Check for line power at the PSU input. Extension cords, power strips, and power cords do fail.

If you have power and no beeps, suspect components in likely order are PSU, motherboard, and CPU.

Running fans and drives and motherboard LED's do not necessarily indicate a good PSU. In the absence of a single short beep, they also do not indicate that the system is booting.

At this point, you can sort of check the PSU. Try to borrow a known good PSU of around 550 - 600 watts. That will power just about any system with a single GPU. If you cannot do that, use a DMM to measure the voltages. Measure between the colored wires and either chassis ground or the black wires. Yellow wires should be 12 volts. Red wires: +5 volts, orange wires: +3.3 volts, blue wire : -12 volts, violet wire: 5 volts always on. Tolerances are +/- 5% except for the -12 volts which is +/- 10%.

The gray wire is really important. It should go from 0 to +5 volts when you turn the PSU on with the case switch. CPU needs this signal to boot.

You can turn on the PSU by completely disconnecting the PSU and using a paperclip or jumper wire to short the green wire to one of the neighboring black wires.
http://www.youtube.com/watch?v=5FWXgQSokF4&feature=yout...

A way that might be easier is to use the main power plug. Working from the back of the plug where the wires come out, use a bare paperclip to short between the green wire and one of the neighboring black wires. That will do the same thing with an installed PSU. It is also an easy way to bypass a questionable case power switch.

This checks the PSU under no load conditions, so it is not completely reliable. But if it can not pass this, it is dead. Then repeat the checks with the PSU plugged into the computer to put a load on the PSU.

If the system beeps:
If it looks like the PSU is good, install a memory stick. Boot. Beep pattern should change to one long and several short beeps indicating a missing graphics card.

Silence, long single beeps, or series of short beeps indicate a problem with the memory. If you get short beeps verify that the memory is in the appropriate motherboard slots.

Insert the video card and connect any necessary PCIe power connectors. Boot. At this point, the system should POST successfully (a single short beep). Notice that you do not need keyboard, mouse, monitor, or drives to successfully POST.
At this point, if the system doesn't work, it's either the video card or an inadequate PSU. Or rarely - the motherboard's PCIe interface.

Now start connecting the rest of the devices starting with the monitor, then keyboard and mouse, then the rest of the devices, testing after each step. It's possible that you can pass the POST with a defective video card. The POST routines can only check the video interface. It cannot check the internal parts of the video card.
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December 19, 2011 1:16:07 PM

Only problem is this system has never had a beep sequence it doesn't make beeping noises and didn't ever before even in the other case
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a c 275 ) Power supply
December 19, 2011 5:45:28 PM

spencahh said:
Only problem is this system has never had a beep sequence it doesn't make beeping noises and didn't ever before even in the other case

Your case doesn't have an internal speaker = neither does mine.
Sounds to me like your psu is faulty and damaged other components.= mobo.
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December 20, 2011 8:00:37 PM

Got everything tested was the motherboard. Not sure what caused it but replaced with asrock 970 extreme3 and a phenom iix4 965 running amazing now
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