The way you have been trying to oc everything it could be a video card on the way out while still not sounding any one long two short beep alerts. The problem seems to be graphical like either driver or hardware related.
With the software side already addressed you have to start looking at hardwares like a fault now being seen with the display adapter one leading cause for problems, the mouse itself, the port or socket it's plugged into, or another glitch from a bad reinstall of Windows or the software/drivers for the mouse itself.