45 isn't a common error and the fact that it only shows up sometimes is strange. If you haven't already you should reset the CMOS after your BIOS update. Does this happen every time on cold boot? If so I would strip down the board to only the CPU and one stick of memory(no peripherals, hdd, odd, etc) and then try a cold boot. If it doesn't happen then you can start adding things back until you find the culprit.
A bus station is where a bus stops. A train station is where a train stops. On my desk, I have a work station…
