No power or computer does not turn on
Note: This page
relates primarily to desktop computers and the most common causes for the
computer to not turn on. More specific troubleshooting steps for a laptop
computer is on our page for a laptop
computer that is not turning on.
Tip: If you
have never turned on the computer before, you should check out our page
about how
to turn on a computer.
If you are uncertain if the computer is turning on or
not, this can be checked by locating any fans inside the computer or fans that
are visible from the outside of the computer. If these fans are spinning, the
computer is receiving power and this document may not apply to your issue.
Note: If the
computer is turning on but is not posting (beeping) or showing any picture on the display, see POST troubleshooting.
Power cord not
connected properly
Verify that the power cord is connected properly to
the wall and the back of the computer. If it looks ok, disconnect and reconnect
both ends of the power cord to make sure the cable is not loose.
Power strip or outlet
If you have a power strip (surge protector) or UPS that turns everything off/on at once, disconnect the computer power
from it and connect the cord directly to the wall
outlet.
If connecting the computer directly to the wall outlet
still does not work verify the outlet works by connecting another electrical
device to that same outlet.
Third-party hardware
If any hardware has been recently added to the computer, it is recommended that you
temporarily disconnect or remove it to ensure that it's not the cause of your
issue.
Note: If the
computer was working fine before you added the new hardware, and the computer
is not beeping but is turning on, see the POST
troubleshooting steps.
Bad power cable
Verify that the cable supplying power to your computer is not bad or damaged by using
another power cable.
Power supply button
Some computer power supplies may have their own power
button, like that shown in the picture. Check the back of the computer and make
sure there are no additional buttons that have been turned off and are
preventing power to the computer.
Incorrect power supply
If you are building a computer, or it has never been
turned on it may have a defective power
supplythat is not supplying enough power. Verify your power
supply meets the requirements of your motherboard, processor, and video card.
Bad battery
If your computer is a laptop or portable computer that
utilizes a battery for mobility, it may be causing your issue.
- If your computer powers on when the cable is connected to the portable
computer, but not when it is disconnected, we recommend you purchase a new
battery.
- If your computer does not power on with the battery and power cable
connected, try removing the battery (if possible) and see if the computer
can turn on with only the power cable connected. If no power is still
received, skip to the final section.
Loosely connected
hardware
As mentioned earlier, each time your computer tries
turn on it runs a POST (Power On Self Test) and if any of the hardware components in your
computer fail this test the computer will not turn on. If the computer cannot
test a component because it has become loose or a cable connected to the device
has become loose then it will fail the POST.
Note: When
inside of a computer make sure you are aware of ESD and how to protect your computer from ESD.
Unplug all cables from the back of the computer
and open
the computer and reseat allexpansion cards and memory in the computer. After all cards have been reseated make sure all
cables are firmly connected by disconnecting and reconnecting all drive cables
and fan cables.
After everything has been disconnected and reconnected
connect only the power cable to the back of the computer and try turning on the
computer. If the computer turns on you can turn off the computer and reconnect
all the cables.
Bad power supply,
button, power board, or inverter
If, after following the above sections, your computer
still receives no power, it is likely that a hardware component in the computer
has failed. It is possible the power supply has failed. If you have a laptop or
do not want to replace the power supply yourself, we suggest taking the
computer to a repair center.
If you have a desktop computer and plan on trying to
repair the computer yourselfopen
the computer and verify the power
connections. You can verify the connection by disconnecting the main power cable
and reconnecting the power cable to make sure it has not become loose. Also,
verify the power button cable is correctly connected to themotherboard.
If the power supply connections look ok, but the
computer still cannot turn on your computer has a bad component we recommend
replacing the hardware in the following order.
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