Computer Turned on and Off Then Back on Again
Why won't my computer plough on?
Updated: 02/01/2021 past Computer Hope
If you have a desktop reckoner that does non turn on later on pressing the ability button, use the following information and troubleshooting steps to aid ready the problem.
I'm not sure if my computer is turning on
If you lot're uncertain if the computer is turning on, check if the instance fan (by and large on the dorsum of the figurer) is spinning. If a fan is spinning, the computer is getting power, and this folio may not apply to your issue.
Power cord not connected properly
Information technology may seem obvious, merely verify the power string is connected to the back of the figurer and plugged into a power outlet. If it appears to be connected correctly, disconnect and reconnect both ends of the ability cord to ensure the cable is not loose.
Ability strip or outlet
If yous have a power strip (surge protector) or UPS (uninterruptible ability supply), disconnect the computer ability cord from it and connect the string directly to the wall outlet.
If connecting the computer directly to the wall outlet still does non work, verify the outlet works past connecting another electrical device.
Bad power cable
Verify the cable supplying power to your reckoner is great or damaged, by swapping it out for another one.
If you don't have another power cable to examination with, see if a friend or a family member has one you lot tin borrow. You tin can as well purchase a new power cable online.
Tip
Some figurer monitors may apply the same blazon of power cable as your computer. If your monitor power cable is removable and has the same type of connector, try using it to power the computer.
Ability supply switch
Some computer power supplies, like that shown in the pictures, take a power switch on the dorsum. Check the back of the computer and brand sure in that location are no additional buttons that are turned off.
Tip
A power supply switch often has a "0" and "1" which is binary for "off" (0) and "on" (i).
Incorrect ability supply
If y'all congenital the computer and cannot get it to turn on, the ability supply may be defective or is insufficient for your hardware's needs. Verify the power supply meets the requirements of your motherboard, processor, and video card.
3rd-party hardware
If whatever computer hardware was recently added, nosotros recommend y'all temporarily disconnect or remove information technology to ensure that it'due south not causing your upshot.
Annotation
If, after you've added new hardware, the computer turns on but is not beeping and the monitor isn't displaying anything, come across: POST troubleshooting steps.
Bad power supply, push, power board, or inverter
If, subsequently following the steps in the sections to a higher place, your computer however receives no power, the power supply may take failed. If you don't want to replace it yourself, we suggest taking the reckoner to a repair middle.
If you take a desktop computer and plan on trying to repair it yourself, open up the computer and verify the ability connections. You can practice so by disconnecting the chief ability cable and reconnecting information technology to make sure it has non go loose. Also, verify the power button cable is correctly continued to the motherboard.
You tin can also examination the power supply using a multimeter to bank check if it outputs the correct voltage. If the voltage output is depression, the power supply is likely bad and needs to be replaced.
Loosely connected hardware
Each time your computer tries to plough on, it runs a Post. If any of the estimator hardware components fail this test, the estimator does not continue to kick.
Notation
When working inside your figurer'due south case, take appropriate precautions to prevent ESD that may damage sensitive electronics.
Unplug all cables from the dorsum of the computer. Open up the reckoner and reseat all expansion cards and memory. After these cards are reseated, make sure all cables are firmly connected by disconnecting and reconnecting them.
Afterward everything is disconnected and reconnected, connect only the power cable to the dorsum of the calculator, and then try turning it on. If the computer turns on, yous can plow it back off and reconnect all the cables.
Bad motherboard
If the power supply connections look ok, merely the computer still doesn't turn on, the motherboard may exist bad. First, open the calculator case and do a visual bank check of the motherboard. Expect for any bulged or blown capacitors.
If you lot recently did soldering work on your motherboard, some of the solder may have connected two or more contact points that information technology shouldn't accept. Those improper connections tin crusade the computer to non power upwards or boot.
Other possible causes for motherboard failure include the following:
- Crack in the circuit board.
- Cleaved pins or prongs for an integrated circuit.
- Melted integrated circuit due to overheating.
While you can attempt replacing a bulged or blown capacitor, it's very likely that the motherboard defects to a higher place require that it be replaced.
Other bad hardware components
If the power supply and motherboard are in good shape and confirmed to non be the problem, some other component may be bad. Endeavour replacing the following hardware components in the order listed.
- Processor and estrus sink
- Video menu
- Sound carte
- Disc drive
- RAM (memory)
- Difficult bulldoze
Annotation
A defective disc drive, RAM, or difficult drive often doesn't crusade a figurer to not power up or boot. However, information technology'south still possible they could cause a powering up trouble if they are shorting out the motherboard in some way.
Source: https://www.computerhope.com/issues/ch000312.htm
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