Rosewell Challenger help.

As far as PSU's I recommend Corsair, Antec or Seasonic.

You are using the ASUS Q connector to hook up the wires from the front of the case? Power button etc.

Get the manual and double check that the front panel connectors are plugged into the right place including the HD light to the ASUS Q connector.
Some of them will go both ways. So you have to make sure (+) (-) are correct.
Make sure the Reset and power cable are plugged to the right spot on the Q-Connector.

Then make sure the Q connector is plugged in properly to the motherboard. It is easily misaligned and IF it is loose on the motherboard connection it will not make good contact.
Bad contact no voltage no power on.
I know from experience. They are great but a bit of a pain.

If everything else is plugged properly the Q-Conn is where I usually have a problem.

Good luck.
Mike

Where am I plugging the HD light onto the Q connector? It is not labeled on it,

As no question is a dumb question

Is there an ON / OFF switch on the back of the power supply ?

Doc, he's saying it humms when he plugs in the power cord. I've never heard of that.

Swifty, I can't answer, I have never used one. But, Hopalong says they are a pain and fit very loose and will not make contact at times. Check the +/- on the connections.

Hi Swifty. First the Q connector is just to get your front panel connections in one place. The MB should accept your individual connectors from the case. They are color-coded and the MB header should have a matching color if not labeled. If you haven't done so yet, get a can of air to blow out all of the parts and connectors, slots, etc, on your board.

As to the power supply issue check to see if its cooling fan is running. It may have gone bad and just showed up after the innards transfer. If it is not running but trying too it could produce the hum. If this is the case, you'll need to get a new one. Blow the power supply out as best you can too.

The brands essenbe mentioned are really good, I have a Corsair myself.

I think I have had a few PSU that hummed slightly. Never had an ASUS MB. Is this the PSU from the old case, or did it come with the new case ?

Thanks for joining in Gary. I'm out of ideas.

Y'welcome Steve.

Since the PSU is a step-down transformer it will have a natural hum, as any transformer does. It is usually drowned out by all the other whirring and spinning devices inside the case.

Oh, if this power supply WAS installed in the case it's most likely a poor one. Most PSUs preinstalled are el-cheapo ones.
Thanks Doc.