If your Mac won‘t turn on. Learn what to do if your Mac won't turn on.
Rule out display issues First, rule out the display as the source of the issue. To be sure you're not having a display issue, press your computer's power button. If your Mac has power but doesn't have any video:
Power issuesIf your Mac won't turn on and you have ruled out display issues, try these steps.
Laptop shuts off when I unplug Dead battery If your battery is dead, the computer will run fine off the power adapter, but will turn off when unplugged. A dead battery can manifest itself in many forms: It may not accept a charge (this particular symptom may also indicate a problem with the logic board), the computer may not recognize the battery, or the battery may be recognized as charged but fail to power your computer when the AC adapter is unplugged. We sell replacement batteries. Flashing question mark on startup. The computer displays the flashing question mark when it can't find a bootable operating system. This could be because your OS is corrupt, the computer doesn't have enough RAM, or your hard drive is failing. Bad operating system Try booting off an OS CD. Run Apple's Disk Utility and try to repair the disk. You could also try Alsoft's Disk Warrior. If this fails, reinstall your operating system. If you can, erase the hard drive prior to reinstalling the OS. Bad hard drive. The hard drive may have been erased, corrupted, or damaged. If the hard drive has been erased, format it as HFS+ and reinstall your operating system back onto it. If it is corrupted or damaged, you need to replace (Core Duo or Core 2 Duo) it. Failing hard drives can display intermittent data corruption prior to failing completely. They often gradually get louder and start to click. If your hard drive is making abnormal clicking noises but still works, back up your data immediately and replace the hard drive. Any of our 9.5mm SATA hard drives will work in your computer. Bad hard drive cable This part fails relatively frequently on the 13" Macbook Pro (Mid 2012), and relatively rarely on other models. If you have the Mid-2012 model MBP, you may want to pursue this before attempting a hard drive replacement, as the cable part is inexpensive and easy to replace. Not enough RAM This is quite rare. If you have insufficient RAM for your computer to boot the operating system, you may get the flashing question mark. Installing more RAM (Core Duo or Core 2 Duo) or downgrading to an older operating system will fix this. You need 128 MB RAM to run OS X 10.0-10.4, and OS X 10.5 requires 512 MB RAM. My screen looks black, but I can see faint graphics on it The screen is very dark, but everything else seems to be running. If you get in close with a flashlight, you can usually see the image faintly. Backlight Issues If your backlight isn't working, the inverter may be bad. Other parts that may be bad are the display or the logic board. If your backlight fails intermittently while moving the display, the problem is with the inverter cables. Otherwise it is impossible to test for damaged parts without replacing them one by one. If you are comfortable taking apart the display assembly, replace the display inverter first, then replace the LCD. If you are not comfortable with this, you can replace both parts at once by replacing (Core Duo or Core 2 Duo) the display assembly (Core Duo, Core 2 Duo, or Santa Rosa/Penryn). If this still doesn't solve your problem, you need a new logic board. The trackpad and keyboard don't work. The computer boots, but the trackpad and keyboard do not work, and USB devices (such as a mouse) do not work. Faulty Logic Board This is uncommon, but it does happen. The problem arises as a result of the design of the MacBook. The section of the board with the ports and the section near the fan slot are grounded via the metal shield on the lower case. Screws in these areas complete the ground circuit for the logic board. If a logic board is tested while not in the case with these screws installed, the result can be a short in the logic board. When this happens, the trackpad, keypad, and input devices do not work. The only solution is to replace (Core Duo or Core 2 Duo) the logic board.
0 Comments
Make sure the monitor is on. If you do not see a power LED (blue, green, or orange light) on the front of the monitor, press the power button until it comes on. If no light comes on after several attempts, make sure the connections are properly connected.
If your computer monitor was on and you stepped away from the computer, then upon returning, it was black, it is likely that the computer is asleep. Try moving your mouse, clicking the mouse buttons, or pressing any key (e.g. spacebar) on the keyboard to wake it up. Connections not properly connected Check the data cable Make sure that you are connecting the monitor's VGA cable to the back of the computer in the 15-pin connector, as shown to the right, or the older computer 9-pin connection. Note: Newer computers may be using a DVI or HDMI cable for the monitor. Make sure the data cable you are using is firmly connected to the computer. Check the power cable If the data cable is plugged in, make sure the monitor is getting power by verifying there is a light (blue, green, or orange) on the front of the monitor. If you see no lights on the monitor, make sure it is connected to a working wall outlet. If the power cord is removable from the back of the monitor, try replacing it with another power cable. If you still cannot power on the monitor after trying another wall outlet and cable, the monitor is bad and should be replaced. Check the LED status If the monitor has a light on the front, but that status light is orange or flashing, make sure the monitor is not in a suspend mode by moving the mouse or pressing a key on the keyboard. If this does not help, turn the computer and monitor off and reconnect the data cable on the back of the computer and, if removable, on the back of the monitor. Turn the computer and monitor back on. If you still encounter the same issue, continue reading through the other possibilities. Monitor settings are not correct Verify the brightness and contrast are turned up or adjust the brightness and contrast. If adjusting the brightness or contrast has no effect on the monitor, continue reading through the other possibilities. Problem with the computer If the computer was working when the screen went blank, the computer might have a problem. Try powering down the computer by pressing and holding the power button until the computer turns off. Once the computer is off, wait a few seconds and then try powering the computer on again. No POST Does the computer beep when it is turned on or does it sound like the computer is working? If the computer does not beep or beeps abnormally, the computer is experiencing a hardware issue or is exhibiting a No POST. Hardware Issue If you have followed the above recommendations and still have the same issue, your computer may have either a bad video card or monitor. The best method of determining this is to do one or both of the suggestions below.
First, check for a small sound icon in the Windows notification area (also known as the Systray), in the bottom right-hand corner of the Windows Desktop. Click on the icon to check if the sound is mute. Adjust the volume to 100% by pulling the lever upward using the mouse.
If this icon is missing, follow the steps below. Windows 10
Below is a full listing of steps on how you can regain or free up computer hard drive space on your computer.
Run the Disk Cleanup option
When performing a Disk Cleanup you have the option to compress your hard drive. We strongly recommend users do not compress their hard drive or compress their old files. An easy way to determine if your computer is in this situation is by pressing the Num Lock Button on the keyboard and watching the Num Lock led to see if it turns off and on. If you can get the light to turn off and on, press CTRL + ALT + DEL and End Task the frozen program. Each program or window you open on your computer takes some of the computers resources to keep it running. If you have too many programs open at one time, your computer may be low on resources, and as a result, is freezing. Try only running one program at a time to make sure your freezing is not being caused by multiple programs running at the same time. Troubleshooting a laptop that does not turn on or boot can be a lot harder than a desktop because of the inability to remove hardware from the laptop. Below are troubleshooting steps to help identify what may be keeping your laptop from turning on.
Connect the power cable AC adapterIf your laptop is only running on battery power, connect the AC adapter to make sure a dead battery is not the cause of the problem. Ensure the adapter cord is correctly plugged in on both ends. Also, if your laptop is using an AC adapter, make sure the cord going into it and the cord coming from it are securely connected. Disconnect from docking station If your laptop is connected to a docking station, disconnect it and try turning the laptop on to verify the docking station is not the cause of the issue. Remove any external peripherals While troubleshooting this issue, disconnect any external devices or peripherals, such as an external mouse or a USB device, to make sure they are not the cause of the issue. Remove and reconnect battery The laptop can also be in a power state preventing it from booting properly. Try disconnecting the power cable and then removing the battery from the laptop. Once done, leave both disconnected from the laptop for at least a minute. After you wait, put the battery back into the laptop, connect the power cable, and try turning the laptop on again. How do I remove the battery from my laptop computer? Drain the computer of electricity Sometimes a residual electrical charge can keep your laptop from turning on. You can think of it as an "electricity clog." By performing the following steps, you effectively drain your laptop of any electricity and start over, which can result in it powering up. Disconnect the AC adapter and remove the battery. Hold down the power button for at least fifteen seconds. Without replacing the battery, plug the AC adapter back into the laptop. Press the power button to turn on your laptop. Note: If this process did not work for you, repeat and hold the power button for one minute or longer at step two. Bad hardware If you have gone through all of the sections above and your laptop continues to not turn on, it is likely a hardware component inside the laptop has failed. We suggest contacting the manufacturer of the laptop for recommendations on how to get it repaired. You can also take your laptop to a computer repair shop and have them diagnose the hardware problem. The computer repair shop may be able to repair the laptop by replacing the bad hardware. |