I have an 18 month old HP DV2058ea. Over the past month or so it chooses to randomly power off. There doesn't appear ot be any specific activity that causes it.
I have replaced batteries and AC power supplies. I have reseated the RAM, even swapping the 2 Dimms over.
I have checked for overheating but it is not that hot and is well vented.
But it still has this totally unpredicatble habit of just switchign itself off for no apparent reason, and then when it does there is no guarantee it will be possible to switch it back on and sometimes I press the power on button several times over before it kicks back into life.
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-try to update the BIOS, its also possible that your notebook is infected with malicious software. If you have a anti-virus system try to run a full scan. You can get the BIOS update from the website http://www.hp.com/, go under support and drivers section. Select the see support and troublshooting information. Type in your product number. So you can get the updates specific for your notebook. Also check your operating system if it is a 32-bit or a 64-bit.
remove battery, press and hold power button for 5 seconds, then wait 5 minutes, put battery back in securely and try again. If it powers on, try and look at the power meter to see if it is registering the power supply. You could have faulty memory chip or faulty power supply
Go to the control panel > Power Options, click on the hibernation tab and uncheck it. Click on apply and ok. Hibernation can damage older HP systems such as the DV1000 that is running XP, make sure it is turned off and also go through the power settings and change the setting for closing the lid on the laptop. Change the setting to "Do Nothing". This will keep your system from getting corrupt.
This is the classic signs of a Virus. You need to recover your data, format and re install your operating system. If your computer suddenly switches off when you move the computer arround then it could be your Power Jack that is faulty. Check diagnostics at: www.powerjackrepair.com