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PSU Problem

Last response: in Components
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April 5, 2010 7:58:20 PM

I bought a Raidmax RX-730ss (730 watt) power supply for my new system and I have a problem. Every time I shut down the computer it will cut off for a few seconds and then the power supply will turn back on and then immediately shut off again, and it will continue to do this until I unplug the power supply. My friend suggested that maybe the power button was stuck on the case, but when I plug the system back in it does not immediately power back on. It will start normally when I press the power button. I have updated the bios, and all the drivers. I am tried turning it off in safe mode and still have the same problem. I want to know if it is the power supply that is the problem or another hardware component.

My Specs:

Windows 7 Home Premium 64-bit
Core 2 Quad Q9400 (2.66 ghz)
4 gigs of OCZ Platinum DDR2 1066 ram
Gigabyte GA-EP45-UD3L Rev. 1 motherboard
750gb Western Digital Caviar Black SATA HDD
XFX Nvidia 275 GTX
Antec Three Hundred Case

More about : psu problem

a b ) Power supply
April 5, 2010 9:48:20 PM

IT could either be a problem with your PSU or your BIOS. If you have another PSU that you can try, I would and see if it does the same thing. If it does, its your Mobo, if not, its your PSU. If its the PSU- its probably time to return or get warranty work done on it (or replace if its out of warranty). If its the mobo, I would look at every setting in the BIOS and see if you can find one that would affect that- I had a board that would restart instead of shutting down, no matter what I did (though it would boot up all the way still) and it turned out to just be a setting in the BIOS that was buried deep in there.
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a b ) Power supply
April 6, 2010 4:14:08 AM

Why bother purachasing a raidmax power supply? Total crap! Antec or corsair psu somewhere in the 500/550 watt range would do it for you.
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a c 136 ) Power supply
April 6, 2010 4:19:06 AM

RAIDmax = they outta RAID the place and give the corporate execs the MAX sentence for putting out those PSU's.
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a b ) Power supply
April 6, 2010 2:14:35 PM

Is this the one u have? Sure its modular but its not worth sepnding $100 on raidmax trash. Much rather u would get a 750 w corsair and just hide the cables behind the mobo tray. Anyway... Any luck withthe bios settings?
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a c 144 ) Power supply
April 6, 2010 6:54:06 PM

Problems with the Raidmax -
Poor quality of build.
Look at the label - you have no way of knowing what the max total 12 volt amps is. And you cannot assume that it is 48 amps.
And even if it is 48 amps, that is low for a PSU with over 700 watts output.

A 650 watt Corsair or Antec can supply better than 50 amps on the 12 volt rail.

You have worked through our standard checklist and troubleshooting thread:
http://www.tomshardware.com/forum/261145-31-read-postin...
yes?

I mean work through, not just read over it.

Breadboard - that isolates any kind of case problem.
http://www.tomshardware.com/forum/262730-31-breadboardi...
Breadboard with just motherboard, CPU & HSF, case speaker, and PSU.
You do have a case speaker installed, right? If not, you really, really need one. If you case or motherboard didn't come with a system speaker you can buy one here:
http://www.cwc-group.com/casp.html

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.

So, the best bet is to replace the PSU with a known good one of similar power capacity. Brand new, out of the box, untested does not count as a known good PSU.

Next best thing is to get (or borrow) a digital multimeter and check the PSU.

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. 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...

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.

Having said all of that, I think your problem is the PSU.
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