For the fixable ones I found that when some USB device was unplugged that it never did the blinking cursor hang. For those I either didn't use the USB device the caused the hang or asked the maker for an updated BIOS to correct the issue.
sometimes when i restart my computer i just get a curser
in the uper left corner then i press the power button off and back on and my computer starts up fine. what could cause this? thanks-dan