If I remember correctly, the power to the monitor is not handled by the regulator board in the Cube. My Cube is running the 17in CRT that was the middle sized option when the Cube was first released. I can't imagine that much current, needed for a CRT, is passing through the VR board. Power for monitors is probably therefore coming from the power brick. Otherwise, as Mark suggests, try all the resets available to clear any corrupted bits. The best of luck. Steve On 5 Jan 2012, at 21:22, Mark Clark wrote: > almost sounds like the motherboard has a point where it can not > handle the voltage anymore or heating up at that point and it > automatically shuts down.... due to wear or repetitive booting.