This problem happens each time I am powering up from a complete shutdown.  I tried running the system check in the lenovo toolbox and it said everything ok.  I tried booting and holding down F1 to run some diagnostic test(this is a bit beyond me but i read to try it).  I start the test, but it will hang at '0% out of 100 completed'.  Can someone help me troubleshoot this problem.  Thanks in advance.