Computer Hardware Help → New PSU, No Boot

I was running a generic 850 watt psu in my system. I installed a new Corsair HX1000.

Before turning the pc on, I made sure the mobo lights were on. Lights were on, everything looked ok.

Turned pc on;
Motherboard onboard led is "- -" suppose to go to FF I beleive
9800gx2's power lights were green - receiving power
Fans and waterpump - receiving power
No video, keyboard/mouse - no power

For kicks, I left the corsair plugged in(fans, hd, dvd) , but plugged in my old psu's 24 pin power and 8 pin power and turned the pc on, and the sucker booted up.

wtf could this be?

Thanks in advance!

Q6700
EVGA nForce 680i SLI Motherboard
8 Gigs of OCZ SLI PC6400 DDR2 @ 2.0V
EVGA 9800 GX2
Thermaltake bigwater 680IS

You've done 90% of the troubleshooting already.

Probe all the 20+4 connector pins with a multimeter. It sounds like something isn't delivering power where it ought to be. If this is a "modular" supply, I'd suspect that one of the connectors wasn't assembled properly.

The corsair is modular, you are correct.

I've gone as far as trying the 2x8 pin connectors that come with it. One is modular and one is tethered (not modular).

They both do not work.

This is extremely strange

So I tried something else....

Corsair is plugged into everything, fans, gpu, hd, dvd, 4 pin molex to mobo and 8 pin to mobo.

External Power Supply is plugged into the 24 port.

Pc boots right up into windows without a problem.

So, for whatever reason, my mobo does not like the corsair 24 port connector?

Possible 'Recessed' Pin on the Corsair PSU's 24-pin connector?

I checked the pins and everything looks fine. As mentioned, everything turns on and gets power.

At this point, I'd consider the PSU to be Defective, and have it replaced under Warranty...

-Tursiops_G.

Well, I decided to buy a new mobo to try it out.
Picked up an Asus P5Q Turbo, hooked everything up, and she turned right on.

For whatever reason the 680i would only accept the generic psu it started with. Very strange.

Ehhhh. Things like that make me lose sleep. There's something wrong in there and even though it *seems* to be working now, I'd be wondering every day whether or when, more likely, the problem is going to reappear.

I suggest that you verify every wire coming from that power supply. By that I mean, verify that all 5V wires are connected, all 12V (although the "separate rails" might make that a little complicated) all the grounds, and so on. Verify that the "power good" does what it's supposed to and that the "power on" actually turns the supply on.

The prospect of a loose wire knocking around inside one of those modular plugs, or in the supply itself, kind of creeps me out.

Tried the corsair on another system at Canada Computers and it worked fine. I'm ruling out the PSU issue.

This mobo is a bit of a mystery. Here is a little history.
Ran the generic 850 for a few months before upgrading to an Ultra 1000 modular. Everything was fine until 4 or 5 power outages in my area this summer in only a couple days.

Last time the power went out, couldn't turn the pc on. Put the old generic 850 back in and it started working. Thought it was kind of strange seeing how this PSU is pretty much brand new and it just stops working because of power outages.....

I haven't tested the Ultra 1000 on this new mobo, but maybe I should. Maybe it'll work lol. Needless to say I'm not a big fan of these nvidia chipset mobos anymore.

Power outages caused by..... lightning, maybe? Can't say as I like the sound of that too much either.

You really ought to consider getting a UPS(s) for your system(s). They're not all that expensive to get a reasonably good one. (I like the Cyber Power Systems CPS900AVR a lot for its construction, component quality, and dual batteries) That will save you untold grief from power issues and will likely prevent whatever damage may have occurred during those outages.

If you do decide to go the UPS route, pay close attention to the Hot Deal web sites. Those things frequently go for significantly reduced prices.

I've been contemplating a UPS.

The power outtages were just "brown outs" I beleive. Power would go out in the area for a few minutes then come back on. Not uncommon while living in Toronto, normal occurrence in the summer lol

It's still possible to get a surge when the power returns, popping things. UPS's are great for preventing damage from such circumstances.

That plug on the modular corsair is probably not seated into the white socket on board.
They require a lot of force to put it in the socket, then will feel it latch.
I just got one last week, and I thought I was going to break the board getting it in, but then I felt it click into the socket.

It sounds like you're running into low amperage on the 12V line, causing the system not to boot. It's well-documented here:

»www.silentpcreview.com/f ··· ?t=30289

Try a different PSU -- really! I have an older Antec NeoHE which doesn't work with a few models of Asus and Intel boards, but works fine with Abit and Gigabyte. I also have an updated Antec NeoHE PSU which works fine with all boards.