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550VX PSU shutting off suddenly (repeatable)


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Last night, my power supply started cutting off all power to the system suddenly.


Sometimes it would restart right away, sometimes it would appear to power up but would not start booting, sometimes there was a few minute delay before power up would begin.


It seemed to be shutting down when power loads were in higher demand--it shut off the first time while playing WoW, and then would last only a few minutes (5-10) before shutting off again if I tried to play a game or started doing anything involving multiple windows or watching videos.


The computer stayed powered up all night when i did nothing but boot and start a virus scan (completed with no threats detected). Then this morning within 20 min of starting up a game, power was cut suddenly again.


There appears to be a buzzing noise coming from the PSU only when the fan is running. When i turned off power to the PSU and let it rest a few minutes, then turned it back on, the fan did not come on and there was no buzzing sound.


[EDIT: The BIOS did not detect any temps out of the ordinary on the processor or the case, and it has been cool in my house. I did a quick check with my hand near the power supply and graphics card, and didn't feel any unusually hot spots.]


I've been using this PSU for a little over a year (bought from New Egg april 2008) with no previous issues. Right up until the second power is cut, the computer operates normally with no performance issues.


Does it sound like the problem is the power supply? I don't even know how to judge if this is an issue with the PSU or if it indicates a short somewhere else (graphics card?) that is tripping some protective shutdown in the PSU.

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There are a few possibilities:


1. Something is overheating, check your temps next time following a shutdown.

2. Possibly a memory problem, use http://www.memtest.org to make sure you are not getting any errors.

3. The motherboard or some other component is going out of spec and tripping the overcurrent/overvoltage protection circuits in the PSU. Try the PSU in a different system to see if you have the same problems.

4. There is a faulty component in the PSU.


I would go down the list and see if you can narrow down the possibilities. If it looks like there is a good chance that a replacement PSU will resolve the issues then, please use the On Line RMA Request Form and we will be happy to replace it. Be sure to check the box that says “I've already spoken to Technical Support and/or RAM Guy.”

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OK-Does not seem to be a temperature problem, but I don't have sensors on the graphics card or the PSU proper.


I didn't consider the memory possibility, I will test when I get home. I will aslo go through and check all my connections to make sure nothing is loose.


I don't have another system myself, but I will try to see if i can find a friend who'll let me try.



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Didn't have to go past step 1--on checking all my connections, i discovered i had been neglecting my CPU fan in dust removal. Cleaning this up thoroughly and making sure it was unbostructed fixed the problem. Computer now runs quieter than it has in months.


The PSU was just trying to protect me from melting down my CPU :)

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