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.
add a comment |. up vote 1 down vote. The flashing question mark means the computer can not find your system folder to boot from. If your Pen Drive has a bootable system folder on it, hold down the option key when booting you computer.The OS will then give you the option to choose a new system folder to boot into.If there is a viable one available.y Macbook for what ever reason has decided to just give me a flashing folder with a question mark on it. I have tried restarting holding the Apple key and. - Nothing. I have also tried holding the. key on bootup but it just gives me an arrow curser and nothing else. I am not sure if the hard drive is even bootable.