You have two kidneys, each about the size of a fist, located on either side of the spine at the bottom of the rib cage. Each kidney contains about one million functioning units called nephrons. A nephron consists of a filtering unit of tiny blood vessels, called a glomerulus, which is attached to a tubule. When blood enters the glomerulus, it is filtered and the remaining fluid then passes through the tubule.
In the first case, each time the computer starts up, the question mark appears and flashes for a few seconds, then disappears. The cause of this symptom is that there is no hard drive selected in the Startup control panel. Remember that selected on the Macintosh means that an icon is darker than the other.
TS1440: A flashing question mark or globe appears when you start your Mac. Learn about A flashing question mark or globe appears when you start your Mac. 15 Items per page30 Items per page50 Items per pageFilter:All related discussionsAll article questions. Previous12Next. 2008 mac book pro screen shows flashing folder with question mark at startup.