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Dead PSU? Help.

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October 9, 2011 5:35:41 AM

Hello,

My build:

Case: Antec 300
Mobo: ASUS M4A89GTD PRO/USB3
CPU: AMD Phenom II x6 1100T
RAM: G.Skill Ripjaws DDR3 1066 (2 sticks of 4GB)
GFX: Galaxy Nvidia GTX 550Ti
PSU: OCz 500W ModXStream Pro

I was playing the Battlefield 3 Beta when all of a sudden my computer crashed, and I pushed the power button with no response. So I unplugged it and re-plugged it in, hit the power button, the blue led light from the fan fired on for a second, then dimmed out slowly. Nothing fired, and I possibly heard something crackle. I checked the motherboard, and they are no burn spots on the mobo, video card, ram, or RAM Sockets.

Any ideas or recommendations? RMA?

More about : dead psu

October 9, 2011 5:40:51 AM

Sounds like it could be the motherboard or the PSU. Check the PSU with a power supply tester(10$ from any computer store) and if its bad then you know for sure.
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October 9, 2011 5:48:30 AM

That sounds good.
I may have a friend from college that has one.
I will check with him tomorrow and post back.

thank you, maxio.
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a c 122 B Homebuilt system
October 9, 2011 5:53:24 AM

Probably the PSU, but might not be.

Those inexpensive PSU testers can tell you if a PSU is bad. They cannot, however, tell you that the PSU is good.

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:
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 (standby power supply): 5 volts always on. The green wire should also have 5 volts on it. It should go to 0 volts when you press the case power button, then back to 5 volts when you release the case power switch. 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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October 9, 2011 6:49:46 AM

Actually they can check to see if the PSU is good, the newer ones have digital displays on them that let you know the voltage levels. Whether or not you want to test a full load is a completly different application which you would need some different devices.
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October 10, 2011 7:11:20 PM

Best answer selected by dejayXYX.
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October 10, 2011 7:13:50 PM

I put the OCZ 500w in my Dell E521 to check it, it was surely dead. Purchased a GS600 from Best Buy, fired right up without a problem.

I do have a remaining question, about my motherboard, possibly someone can direct me?

Any chance of my motherboard or other components being damaged from the PSU suddenly dying?

Again, thank you all for your help. Very much appreciated and very evident why I make tomshardware my number one spot to get input/help.
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