Upgrade PSU, killed PS2 and USB ports? WTF?

[TurboRegal]

Okay I'm baffled at this one...
I just upgraded my PSU. My PC boots into windows fine, but my ps2 ports don't work (tried 2 different keyboards) and my USB ports don't work either (I think, I'm going to test something else in them)

WTF?
Any thoughts? My keyboard doesn't even flash it's lights on booting nor does it work in the BIOS?

Argh

[TheDoctah]

Most likely you have gotten a defective power supply that lacks the 5V rail.

All those peripherals ...PS2 and USB use 5V. The rest of the PC, CPU, HD's etc, use 12V.

I would exchange it while you can still do it in store and more importantly stop using it incase it is slowly killing (or hasn't already) killed all those 5V things.

[TurboRegal]

Just tried my old PSU out, still no dice? The USB ports aren't getting power either?

Maybe I'm missing a plug? I'll recheck...

[TheDoctah]

the old psu worked fine before?? (side question....why did you change it then)

but if u replaced the old working psu and its still not working, sounds like your motherboard 5v regulators are gone then.

There is no special connection for 5V ....usb nor ps2....it all comes off the motherboard. Which from the power supply comes through the large....20-24 pin connection. Inspect the capacitors around that connector, if a capacitor has blown or a regulator has gone bad you will visually notice the difference compared to the others

[TurboRegal]

the old psu worked fine before?? (side question....why did you change it then)

but if u replaced the old working psu and its still not working, sounds like your motherboard 5v regulators are gone then.

There is no special connection for 5V ....usb nor ps2....it all comes off the motherboard. Which from the power supply comes through the large....20-24 pin connection. Inspect the capacitors around that connector, if a capacitor has blown or a regulator has gone bad you will visually notice the difference compared to the others

Old PSU worked fine, replaced it because it was a little loud and I needed more watts for a new video card (not put in yet)

Is there anything else that runs of 5v? My fans etc are all still working?

[TheDoctah]

umm....nothing else really....Fans are 12V also...

What brand is the power supply? If you have a multimeter you can test it to see if it is actually producing 5V to verify.

Its beginning to sound like your motherboard is the problem though.....possibly induced by the new power supply if it was working before you changed it. If thats the case, you are in a bind, you can either try and fix the regulators on the motherboard or go motherboard shopping, because without 5V theres no way to get a mouse/keyboard working, both methods (usb/ps2) require it.

Even if you purchase a PCI-usb card it still won't get the proper 5V since that also depends on the motherboard supplying the right voltage.

[TheDoctah]

If you have the multimeter and want to test...you will find this page useful.

http://www.xtremesystems.org/forums/showthread.php?t=41120

Most important......green....signal
yellow....12v
red....5v
black.....ground

[TurboRegal]

And of course, I don't have a multimeter with me, I packed it away thinking I wouldn't need it and left it in storage :|

Networking works fine if that tells you anything (it is right next to the USB port after all :cheesygri)

[belowzeros]

chances are the little fuse on the motherboard that is attached to those ports blew when you changed over PSUs. This can happen when you don't discharge the PSU completely before removing/changing.

I don't know if that's what happened to you for sure but it sure does have the right symptoms. I've seen this a lot. You have to RMA the motherboard unfortuneately when this happens, it's not a user serviceable part.

[TurboRegal]

Heyo! I must have bumped off the jumper when trying to get the 4pin mobo connector off (I remember it being super tight)

Found the jumper eventually, popped it back on, and all works well!

:D

Thanks all!

[TheDoctah]

haha nice. Such a simple solution, after all. Go figure!

I didn't even know there was a 5V jumper on some motherboards, why on earth would they put that? I know they have the 5V standby jumpers, but those usually don't throw out 5v entirely when not being connected.

Good thing too, mobo shopping would've been a burn.

Happy computing.