Over the last 24 hours or so I have been having a really unusual problem when trying to wake my computer after putting it into sleep mode. When I click the mouse, the PC turns back on, but the monitor power light continues to blink and all of the devices I have plugged into USB ports don't power up (including, bizarrely, the mouse). Unplugging these devices and plugging them back in sees a brief flash of light before they go back to being unresponsive, with the exception of my external hard drive, which for some reason has no problem.

I've been into device manager and made sure that the mouse and keyboard are allowed to wake the computer from sleep mode and after that didn't work unchecked the boxes for the USB Root Hubs allowing Windows to turn them off to save power. I've been into the bios, but was only able to find options for ps/2 mouse/keyboards to wake from sleep state in the APM. There are only two things I can think of that have changed in this time, I increased the clock speed on my 2500k to 4.7Ghz and bought a new Xbox 360 controller to replace the old broken one. I'm not sure how either of those would cause this problem though.

I ran powercfg/energy and the report threw up 9 errors, 8 of which were variations of this:
whereas the final one told me that at 16.5%, the average processor utilization during the trace was too high. In the warnings there is something that sounds like it is pointing me towards a solution, but I don't actually understand it:

My PC supports S1/3/4 sleep states, so I'm assuming it is using 3 by default though I'm not sure how to check that. If anyone has any idea what I'm doing wrong, please let me know! In case it is something in the BIOS, my motherboard is P8P67 series. Thank you.