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I've seen this before in desktops and laptops. Either your fan doesn't spin at sufficient speed to cool the CPU or something is working your laptop to hard. Some virus software (Norton) randomly start a process that scans every file in your hard drive, which takes almost all your CPU power. If that is the case, boot in Safe Mode and uninstall.
Michael I am afraid that English my fails me now. Is the power on when you mean that you have shut the laptop down. If that is the case it helps to close every program down before shutting down. good luck Kolbrun
Since I don't know your laptop's brand / model, I will give you general details. Shut down your laptop (not hibernate, just shut down) from the start button at the lower left corner of the desktop. After the laptop shut down remove the power plug and the battery from it's place. Put the laptop upside down and unscrew all the screws at the bottom that hold a separate smaller cover. Slide the cover out and unscrew the inner screws in order to disassemble the parts of the laptop like hard disk, memory etc. At the end unscrew the screws that hold the main bottom cover and slowly open it up. It's a good idea to keep a note of what screw goes where especially if they are not all the same. Use a soft brush (and if possible air under pressure) to clean up pedantically the air blinds all around the laptop. In case of using air under pressure leave the laptop to "rest" (and the temperatures and humidity to balance) for about 15 minutes. Reassemble the laptop at the reverse order.
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Thanks and regards Please kindly rate this solution Stelios direct fixya link: http://www.fixya.com/users/technical114
The reason for the sudden shut down of your computer is because of overheating of the 'case', where the CPU is mounted. Overheating can be due to dust accumulation on the heat sink, which prevents dissipation of heat. The possible solution to combat overheating issue is to keep the laptop dust free by cleaning out debris at the vents frequently. Note that a laptop has a much smaller cooling area in comparison with desktops and hence laptops tend to accumulate dust a lot quicker than desktops. This is because all the dust/debris, in the case of laptops, accumulate in the cooling fins.
Get more information to fix Acer shut down issue :
First thing to do is shut down, pull the power cord, press the power button for 10 seconds to bleed off the ectra power, open the case, Take out the memory modules and then reseat them carefully. Power the system back up with the case door open. If it boots up, shut down, close the case and reboot.
Is it possible that you have changed the settings of what buttons do what on your system? E.g. you could have changed the power button to "switch user" instead of "shut down", to check this (in XP) go to "Power Options" (in Control Panel" and then click on the "Advanced tab" at the top, then select "Shut down" from the drop down menu at the bottom of the window.
If this is already set to shut down then maybe you could do a system restore in case another setting has been changed, restore it to before the PC started doing this.
Alternatively try actually choosing "Turn off Computer" from the Log On screen (press Ctrl + L to get to this screen, or choose switch user/log off). If you are using Vista I beleive that there is a shut-down option from the Log In Page there (which again you can access by pressing Ctrl + L on the keyboard.
You might have a broken or dirty CPU fan. The CPU heat sink fan is responsible to cool down your CPU while it is on. If it is broken or stuck(dirty), then your machine will power off automatically preventing CPU damage or worse-case-scenario:FIRE caused by "burnout".
Your CPU heat sink might not be mounted on your LT properly. Also causing overheating; thus shutting down.
Its a laptop right ? Right! Another thing you could try is to unplug the battery, and let it run from AC power only and see if it makes any difference.
In either case, it could be one of your fans is not functioning. There is a fan on top of the heatsink on the CPU. If it's not turning then the CPU will shut itself down before it's destroyed...this is a good thing. If this is a desktop then the case fan may have failed. Make certain both of these fans are turning. You will need to open the computer to see the CPU fan.
If they are both turning then it's possible the CPU heatsink fins are filled with dust. This prevents airflow. If this is the case, use your vaccuum cleaner to get the dust out. This will be much easier if you have a desktop, opening laptops is more involved.