For some strange reason my computer will randomly and intermittently refuse to start up into Windows after I turn the power switch on. The computer always turns on and goes past the POST test and even comes close to booting into Windows by going past that screen with the little green squares that go back and forth but after that if it doesn't boot the screen just stays black. If I kill the power and make repeated attempts to start the computer it will finally boot up normally. Other times this computer will boot up the first time with no problems at all. In all cases, once running, this computer works great and illustrates no errors. Can anyone offer any solutions about the intermittent startup problems?