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Antec EA-750 not working with Dimension 5100

post #1 of 8
Thread Starter 
Hello Overclock.net community,

While I have read countless forum threads on overclock.net for help, advise and knowledge, this is my first time posting... and I need some help, advise, and knowledge (I also hope this is in the right location)

I am working on updating an older computer. It's a Dell Dimension 5100 over 6 years old. I am upgrading the Radeon X300 with an EVGA GeForce GTS 250, but this requires a bit more power than the stock PSU (305W). For that, I bought an Antec EA-750 (750W) PSU. (I know 750W is overkill but I plan to use this PSU, as well as the GPU, in a future build)

Here is where the problem lies, the computer will not turn on if the EA-750 is installed, but works with the old stock 305W (with the only two Peripheral Power Connectors supplying power to the GPU instead of the Optical Drive )

Some details:

A Green light on the MB turns on when the EA-750 is turned on.
When the front panel power button is pressed, nothing happens when the EA-750 is installed.
The EA-750 fan does not turn on when installed in the Dimension 5100
The ATX 24 pin 12V Power Connector is exactly the same for both the 305W PSU and the EA-750
The EA-750 passed full voltage testing using a multimeter following these guidelines:http://pcsupport.about.com/od/toolso...multimeter.htm
The tested ATX 24 pin 12V Power Connector voltages on the EA-750 fall well within the standard Power Supply Voltage Tolerances
The ATX 24 pin 12V Power Connectors on both power supplies and the MB are not damaged (as far as I can tell)
The MB and the ATX 24 pin Connectors do not have a -5v pin

I am about to RMA the EA-750 but I honestly don't know if that will fix the problem since I can't find what is actually wrong with the PSU. If anyone has any advise, I would be grateful.

Again, I hope this thread is in the correct place and I would appreciate any help. Also, since this is my first post, I want to thank the community for being such a great help and such a fantastic knowledge base in the past
    
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post #2 of 8
Well, it's certainly possible you got a DOA unit.

The motherboard light turning on indicates that the +5V standby circuit of the power supply is at least functional and that there's no proprietary connector nonsense going on.

Aside from being DOA, only thing I can think of that might possibly cause the problem is some motherboards are very picky about startup time and the voltage sweep involved... But the only case I know of where that's caused problems in the past is with certain combinations of Enermax PSUs and high end Asus and EVGA motherboards in 2009/early 2010.



Soooo probably just a DOA PSU. At least that's where I'd start.
post #3 of 8
Thread Starter 
Phaedrus2129, thanks for the quick response! I am going to RMA it, once I get the new PSU ill post the results.

Also, the thread you wrote on Antec is quiet good.
    
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post #4 of 8
Hi,

To be sure that it's really not functional you could quickly bridge the green wire to a black one on the ATX connector. After you bridged it with a paper clip for example, turn the PSU on and see if it's running. Don't attach anything else to the PSU.

If you are uncertain how to do it please just RMA it.

Christoph
post #5 of 8
Thread Starter 
Hi Christoph,
The power supply does indeed work when you bridge those wires. I've fully voltage tested every pin on the ATX while those wires were bridged. The fan also comes on when those wires are bridged. At this point, I have RMA'd it, we will see if that fixes the problem.
    
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post #6 of 8
Quote:
Originally Posted by TheModernGeneral View Post
Hi Christoph,
The power supply does indeed work when you bridge those wires. I've fully voltage tested every pin on the ATX while those wires were bridged. The fan also comes on when those wires are bridged. At this point, I have RMA'd it, we will see if that fixes the problem.
Hi, if it worked bridged then a new unit won't change the situation unfortunately. Let me know how it continues please.

Christoph
post #7 of 8
Thread Starter 
Well, not to beat a dead horse, but I've got an update to this problem. First off, it was not fixed by the new unit. Same symptoms. Another bit of info though: I recently got an Antec CP-1000, plugged it into the Dimension 5100, and it booted like a champ... which leads me to believe that the EA-750 is incompatible with a Dell Dimension 5100. Which also leads me to wonder why this is not documented anywhere. For curiosity's sake, is there any reason they could be incompatible? I know Phaedrus mentioned startup time or voltage sweeps, could that be the case and is there any way to test it?
    
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CPUMotherboardGraphicsRAM
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Hard DriveOptical DriveOSMonitor
WD Caviar Black 1TB SATA 6Gbps LG SuperMulti Windows 7 Pro x64 Asus 19" VE198T 
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post #8 of 8
PSU's have a delay measured in ms for the PSU's PWR_GOOD signal to kick in which causes a rig to post.

ATX 12v v2.3 Guidelines allow between 100 & 500ms delay on this signal.

It's possible though that the board itself only accepts a smaller range (like 200-300) and the Antec is currently around 400ms (or basically any arbitrary number above what the Dell Mobo wants to accept.)

There's nothing you can do about that.
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Test Bed
(24 items)
 
TTTbox
(15 items)
 
 
CPUMotherboardGraphicsRAM
Core i5 3570K  Biostar TZ774XE Power Color AX5770 1GB 4x4GB 1866Mhz 9-10-9-27-2T 
Hard DriveHard DriveHard DriveHard Drive
Samsung Spinpoint F3 1TB Samsung Spinpoint F3 1TB Western Digital Green 2TB Samsung Spinpoint M4 500GB 
Hard DriveOptical DriveCoolingOS
Intel X-25M G2 80GB Lite-On BluRay Drive Arctic Cooling Freezer 13 Pro Windows 7 Ultimate 
MonitorKeyboardPowerCase
Dell U2212HM Deck Legend Frost Tactile Silverstone Strider Plus 750w Custom Acrylic Test Bed 
MouseMouse PadAudioAudio
Logitech G500 Cooler Master Storm Tactics FPS Beyer Dynamics DT-990 600ohm Samson MediaOne 3A 
AudioAudioOtherOther
FiiO E09k QOGIR FiiO E17 ALPEN Microsoft Lifecam Studio Blue Yeti Pro Microphone 
CPUMotherboardGraphicsRAM
AMD A10-A5800K ASRock FM2A85X-ITX Radeon HD7770 1GB 2x8GB 1866mhz C9 
Hard DriveHard DriveOptical DriveCooling
SanDisk Ultra Plus 128GB 2TB 5400 RPM  24x DVD Drive Noctua L9A 
OSMonitorKeyboardPower
Windows 7 Home Premium 32" IPS TV Logitech K400 Seasonic G360 
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