You are saying that you have to hold down the power button. Does that mean that the shutdown option on the start menu does not work at all? If you try to use it do you get any error message? Do any of the icons in the lower right systray close or does nothing seem to happen?
You may or may not need a BIOS upgrade as this could be an issue with Windows. You can always install a BIOS update to the latest if you want but as always the manufacturer disclaimer is that it is better not to update unless it is actually causing a problem.
A bus station is where a bus stops. A train station is where a train stops. On my desk, I have a work station…