My laptop won't power up. It tries to power up, then stops and makes a hiccup noise. It then powers down and tries to power up again. This happens over and over again. The only way to stop this is by unplugging it and taking out the battery. Help!
I have an HP Laptop zd7020us and I had problems with it booting up. When I turned it on, it would run for about 15 minutes and then freeze. CTL-ALT-DEL would not work, so I had to power down by holding the power button for 4 seconds. After troubleshooting for quite some time, I finally found the problem. I had two sticks of ram and after trying each stick individually, I am running with only one stick. The other one was faulty.
Other indications that this might be your problem: After it runs for a short time, it will not allow you to boot up again. All the power lights come on, the fan kicks on, and you can use the CD/DVD drive, however, it doesn't POST.
This is an indication of faulty RAM.
Hope this helps someone and stops you from buying a motherboard unnecessarily.
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1. Your power adapter is damaged/not working. Look and see if a LED is illuminating on the power adapter. If it is chances are it is working fine and the problem may lie on your laptop. If not replace it. The easiest way to tell if your power adapter is bad is to go out to Wal-Mart or your local technology store and purchase one of their universal power adapters. They are expensive but you can buy it, try it, and return it if it does not solve the problem.
2. The DC pin on your laptop is bent/broken/loose. Look at where your power adapter plugs in on your laptop. Get a paper clip, bend it out to make a long paper clip and slightly push its tip on the pin inside your laptop. If the pin moves chances are either the DC pin needs to be soldered down or needs to be replaced. The part is usually cheap around $10 but the labor can cost more than $50
Remove main battery and try again, have the power supply adapter checked, the DC jack in the motherboard is another source of trouble from no power to intermittent operation, at this point the laptop must be dismantled to down to the main board to address the issue.
Remove main battery and try again, next! have the power supply adapter checked for output voltage, if okay! the DC jack in the laptop is a common source of trouble, at this point the laptop must be dismantled down to the motherboard level to address the situation.
This maybe heat problem. When the CPU overheats then it will shut down (i.e. thermaloverload) and won't boot up again until it has cooled down. If this is theproblem is not fixed then the CPU will eventually fail. A faulty fan causes the problem or the fan and heat sink assembly are cloggedwith dust. Check the CPU fan to see if it spins freely, if not replace the fan. If the fan and heat sink is clogged with dust the remove the dust and make surethe vents are clear and dust free. Use a small brush and can of compressed airto do this.
Take out the AC power jack and then remove the laptop battery. Plug AC power back in and see if the laptop will turn on. If it turns on let it boot the operating system and then shut down as normal, remove the power cord and reinsert the battery and again see if it will switch on. If it does then there has been a glitch with the battery. If it doesn't then there is a problem with the battery.
If the laptop won't switch on either with or without the battery then there is a possibility that the motherboard has developed a problem.
Hold down the power button for 10 seconds. That will hard-shut the PC. Once that is done, fire it back up, and try again. Somethimes, windows will act goofy shutting down. Especially Vista when it is left on too long without shutting it down.