Hey all, sorry I haven't posted in a long long time, been very busy with school and all that 
I've got a Sandybridge based Z77 build, and more recently it's started playing up somewhat. At random (frequent) intervals the PC will just 'locks up'; freezing the mouse and keyboard, but leaving the display active. After locking up the display will go to sleep and I will have to move the mouse to get it working again. I also hear the device disconnect sound at this point. It can be one or the other at different times but more recently it's been both symptoms together. My PC has also been known to lock up for a few seconds and release a beep after. So far searching the internet has been no luck.
My question is do these symptoms sound familiar to anyone? If so do you know what it might be?

I've got a Sandybridge based Z77 build, and more recently it's started playing up somewhat. At random (frequent) intervals the PC will just 'locks up'; freezing the mouse and keyboard, but leaving the display active. After locking up the display will go to sleep and I will have to move the mouse to get it working again. I also hear the device disconnect sound at this point. It can be one or the other at different times but more recently it's been both symptoms together. My PC has also been known to lock up for a few seconds and release a beep after. So far searching the internet has been no luck.
My question is do these symptoms sound familiar to anyone? If so do you know what it might be?