Problem - usb device over current status detected

[UKMach]

As the title states on cold booting my BIOS states this after recognising the harddrives:

“usb device over current status detected your computer will shut down in 15 seconds”

Of which the PC will shut down but on second boot will happily go all the way into windows, the only other problem ive encounter is my xbox controller randomly disconnecting during rocket league (which seems to aggravate my team mates more than me) but even this is intermittent. My thinking is that a USB device is short circuiting or that one of the USB sockets are short circuiting. The problem that I have is that I cannot replicate this ad-hoc. As soon as I restart the PC it seems to disappear and boot fine and will keep on booting all day without an issue untill I go to sleep and wake up the following morning. Yes its like ground hog day. I guess you could state it only happens on cold boot.

What ive tried:

Isolating issue to just USB sockets attached to back of motherboard
Cleaning all USB sockets
Attaching keyboard to ps/2 port
Minimising all USB connections to just mouse - im thinking tomorrow morning im just going to have to disconnect everything and see if it still happens, that way I will know for 100% if its a socket or a device causing this.

What I would like to know:

Anyone else with this problem and knowledge about what could be causing it?
Could I be wrong and could there be a link to PCI3 overloading the bandwidth for USB?
Anyone think of how to replicate this adhoc so I can go through the motions and just elimentate this down to what ever is causing it. At the moment its painfully slow to do this.
Im ruling windows 10 drivers out as the problem starts in BIOS but could this be an issue?

System:

Windows 10

Mobo: ASUS p8p67 deluxe, this is not the revision B3 model which I didnt want to RMA as only just bought when out in 2011. Cant remember exactly what was wrong thinking about it now.

PCIe Cards (in order down the pc):

ASUS essence STX ii – x1 lane
MSI 980GTX – x8 lane
Nothing – x8 lane
Soundblaster Z – x4/x8 lane

PCI slots – nothing attached

CPU/RAM - Core i7 2600K Sandybridge / G.Skill RipJawsX 8GB DDR3 1600MHz

Sata ports (attached to first 2xintel and 2x marvell 6Gb):
OCZ Vertex 3 120GB, OCZ agility 240gb, Samsung 1Tb, Cd/DVD recorder

USB devices:

Dell Monitor 3.0 USB
Logitech Mouse
Xbox controller
Colormonki display ambient light detector
Soon to have X55 throttle and stick

 

[UKMach]

So this morning I disconnected every single usb device, including internal/front attached ports which left just the rear usb ports without anything attached. Same problem, rebooted and now everything is fine, again if I try to replicate the problem its like it never existed other than when I cold boot after several hours of the PC being shut down. Even if I take the power cable out for 30 minutes and then boot, its still fine.

 

[UKMach]

I dont have another PSU to try unfortunately. I think youre probably right, im going to have to take my build apart, start from scratch, clean everything up and try to work out what is happening. Its proving to be a lot of work for something that isnt a major but really annoying problem. Then again my other concern is that will this develop into something that does cause major and expensive problems down the road, although ive got nothing to really base that concern on currently.

 

[UKMach]

Update- ive taken out the Mobo, given the pc a winter clean and put it all back together. I have also put folded strips of paper in all non used USB ports to try and isolate that port from itself. Most ports where really easy to put the paper in, but two of them where very difficult and I think they may be the problem. Ive also chagned the second sound card to the bottom PCIe port.

Its early days yet but the last two boots seem to be fine, no problem!! Im going to leave it for a little bit and see if it comes back and then I plan on taking one piece of paper out at the time to isolate it down to any faulty USB ports. Its the only way I can think of problem solving it.