Strange PSU issue

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SS92

Reputable
Sep 22, 2014
2
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4,510
Hi all, although I appear new to the forums I have been scouring it intensely over the past month in prep for my first build and throughout the troubleshooting period. To proceed, the issue I face is that for some reason the PC will not start up at all when I change the PSU. I initially changed a corsair CX 430 to an XFX 750w and all I got was the power led turning on, but the pc remained off - no beeps, nothing. Reverting to the corsair enabled the PC to work normally. That XFX PSU was then installed in another PC proving that it wasn't faulty. I later tried to install an EVGA G1 650w and the same occurred as with the XFX, except this time reverting back to the corsair didn't "fix" the problem.. Everything was hooked in each time I inserted a different PSU, and I had also read the thread regarding issues preventing boot/post. For the time being I'm trying to get a hold of a replacement motherboard, but I don't want the same to occur again. I'd like to add that the corsair was the very first PSU I attached in the rig, (if that makes any impact?) Any ideas guys?

Components:

Asus M5A97 EVO
AMD FX 6300
Sapphire R7 250x 1gb
2x4gb Crucial ballistix sport XT
Freezer 13 cooler
Antec GX 500 case
Corsair 430x (only PSU that works with the setup at the moment)
 
Solution
TUNDER_POOP
Check that you have place the ATX power connector for the CPU in properly, I have no idea on the level of expertise you have with PC building, but I know that I messed that up on my first go :p

Make sure that the CPU is seated correctly as well.

After you check these two, you are right (unfortunately) about looking into a replacement motherboard.

Best of luck!
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TUNDER_POOP

TUNDER_POOP

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Aug 6, 2012
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Check that you have place the ATX power connector for the CPU in properly, I have no idea on the level of expertise you have with PC building, but I know that I messed that up on my first go :p

Make sure that the CPU is seated correctly as well.

After you check these two, you are right (unfortunately) about looking into a replacement motherboard.

Best of luck!
 
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Solution
S

SS92

Reputable
Sep 22, 2014
2
0
4,510
Ty for the reponses guys. The CPU was already seated correctly and untouched after as the machine was working fine prior to attempting to switch the PSU. I made sure all the wires were firmly in too. One thing I can say for the first attempt in switching to the XFX was that at on 1/5 attempts to switch the machine on, all the fans spun for one second but then stopped and on one occasion it did start very briefly and something about compatibility support module popped up on the screen.. why that would pop up I have no idea.. But the rest of the attempts resulted in nothing happening. But that was ok, since at least I could put the old PSU back, now no PSU works lol. A few points to note, the 24 pin slid in and out very easily for the corsair, but after changing it with the EVGA (which was very hard to insert) the 24 pin was much harder to insert - any chance something that that slot could have been damaged? I haven't tried a CMOS reset, Blackbird. Could someone kindly elaborate on how to? Sorry for the long responses btw.
 
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wkitchen

wkitchen

Reputable
Sep 15, 2014
24
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4,520
You just have to take the little round battery out of the motherboard, wait a few seconds and then re-insert it. Then try to boot. If that doesn't work, here is what I would do:

1st: Verify that the 12v rail on your new power supply delivers enough amperage to operate your GPU. This gets people in trouble a lot of times.

2nd: (If step one is clear) Disassemble everything and put it back together again. Sometimes doing this will resolve issues you didn't even realize were there. Plug it up to a different known working outlet and try again.
 
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