No Laptop Power

| December 2, 2009

laptop_power_supplyTroubleshooting no laptop power issues can be difficult for both end-users as well as technicians because of the various form factors, batteries and power supplies used by different manufacturers. There are steps you can go through to do a process of elimination, and based on those results, you may need to take the laptop into the shop. You can try a new power supply, as they are external, and even replace the battery, but beyond that the laptop will need professional servicing.

No Laptop Power Troubleshooting

  1. Does the power come on when you wiggle the cord? If so, the cause can either be a loose solder join on the laptop, or a worn plug on the power supply. Inspect each carefully.
  2. If your laptop can work without the battery, try removing the battery and plugging the laptop in. If it powers up, the laptop battery is likely defective or dead.
  3. Does the laptop beep? Just as with a PC, there could be non-power-related issues that prevent the laptop from starting.
  4. Do you hear fans? If so, it’s quite possible the display has gone bad. Try an external monitor to see if the laptop itself is working.
  5. If you still have no laptop power, you should test the power supply and then replace the battery if the power supply checks out. To test the power supply, see below.

No Laptop Power – Test The Power Supply

no laptop powerTo test a standard laptop power supply, remove the plug from the computer and insert the red probe into the opening of the barrel connector of the power supply. The black ground probe needs to be placed on the outside of the power supply’s barrel connector. Just be careful not to touch the probes together. You should receive a reading close to what is printed on the power supply’s label. If not, it’s likely you have a bad power supply.

Other laptop troubleshooting articles.

Category: Troubleshoot

Dave

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Dave has been providing free computer repair and tech support advice online since 2002. Join us on our forums and be sure to subscribe to our newsletter for weekly tips and other helpful computer articles. Connect with me on: Google+

Comments (3)

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  1. jeremiah michael says:

    your explanation is clear and well understood.And it is practical knowledge.
    question:what could be the problem of a laptop battery that is not working in the laptop but works in another laptop?

    • Dave Dave says:

      I would look at the interface between the the bad laptop and the battery. Clean connectors, see if they feel loose. Or they may be a problem internally that is preventing the laptop to run. have you tried another battery on laptop A? If the second battery works, then I’m stumped. If it doesn’t, then there must be another issue.

  2. Great article. I have many customers are have this issue: the laptop battery is dead, then the laptop can’t start up even with the power supply plugged in.